Evaluation of diamond's quality

FIELD: measuring technique.

SUBSTANCE: to determine if green-blue was subject ct to artificial irradiation or to ion bombardment, it is irradiated with light at wavelength of 633 nm for stimulation of luminescence emission, and luminescence is detected within range of 680 to 800 nm by using confocal microscope and spectrometer. Focal plane is canned in vertical along diamond. Quick reduction in luminescence accompanied with increase in depth points at natural illumination while even quicker reduction points at ion bombardment. Alternatively, to determine if diamond has to be natural/synthetic doublet, diamond is subject to irradiation at wavelength of 325 nm to stimulate emission of luminescence and luminescence is detected within 330-450 nm range. Sharp change in luminescence at increase of depth points at the fact that the diamond has to be natural/synthetic doublet.

EFFECT: ability of automatic precise evaluation.

44 cl, 10 dwg

 

Background of the invention

The present invention relates to a device for assessing the quality of a diamond, especially for detection, did diamond artificial irradiation or ion bombardment, to change its color, or whether the diamond is natural/synthetic doublet.

Natural green diamonds get their color by irradiation existing in nature radioactive isotopes that produce alpha particles, when radioactive isotopes are near diamond in the land. Alpha particles penetrate only to a depth of about 30 μm under the surface of the diamond, and form of radiation damage to diamond lattice, mainly in the form of lattice vacancies. Vacancies cause the characteristic system of vibrational absorption in the red region of the visible spectrum, causing a green-blue color.

However, artificial irradiation or ion bombardment (ion implantation) can be used to create a green-blue color diamonds. This treatment is usually applied on polished diamonds, but processing can be used on rough diamonds. Artificial irradiation is usually performed using high energy electrons, which have a penetration depth into the diamond a few millimeters, a significantly greater h is m when irradiated with alpha particles, or use fast neutrons, which have a penetration depth into the diamond of several centimeters, which is significantly greater than when irradiated with alpha particles. Ions with high energies used for ion bombardment, as a rule, have a penetration depth of about 1 μm in the diamond, much less than under natural irradiation with alpha particles. For this reason, in order to ascertain whether rough or polished green-blue diamond irradiated naturally or artificially, it is necessary destructive way to cut a diamond across and to observe the penetration depth of color beneath the surface.

Because naturally irradiated diamond jewelry may dictate a higher price than diamonds, which got its color due to artificial irradiation or ion bombardment, requires an appropriate method of study, to ensure consumer confidence.

Natural/synthetic doublets can be produced by deposition of synthetic diamond, natural diamond, as a rule, in his polished or partially processed state, for forming part of the crown or pavilion of the doublet. There are ways to determine whether the diamond doublet - see, for example, applications WO 94/20837, WO 95/2012, WO 96/07895, WO 96/07896, WO 97/04302 and WO 97/04303. These methods are unsatisfactory because they cannot be automated and/or require expensive components.

The aim of the present invention is to overcome or partial removal of at least one of the disadvantages known from the prior art methods, or create a useful alternative.

As a rule, are desirable automatic quality assessment and the establishment of a methodology that can be used for different diamond or diamonds set in jewelry.

Description of the invention

In its broadest aspect, the present invention provides a device, as stated in paragraphs 1 or 22 claims, and methods, as stated in paragraphs 23 or 24 of the claims. The remaining claims relate to preferred or optional features of the present invention.

From a General point of view, can be detected any change in the material, which consists of a diamond. However, this method is used primarily to detect whether the diamond artificially irradiated or subjected to ion bombardment, to change its color, or to detect whether a diamond is natural/synthetic doublet. It would be possible to have a device on oingo destination containing two different means of exposure to radiation at different wavelengths; detecting the luminescence, for two different purposes, which would be very similar, but the means of comparison would be different.

Any characteristic of the luminescence can be compared, but preferably compares the intensity of the spectral features of the luminescence. Detected luminescence can normirovanija, by correlating it with the characteristic emission of the luminescence of diamond, preferably Raman. This normalization procedure allows adjustment results in a change in the efficiency of collection or on the size of the stone.

If the diamond is artificially irradiated by high energy electrons or fast neutrons, to change its color, reduction of detectable luminescence with depth is less rapid than the decrease with depth for the case of diamond, which was exposed to naturally. This is discussed in more detail below in connection with figures 4a, 4b and 5 of the attached drawings.

When using ion bombardment of high energy ions decrease detectable luminescence with depth is more rapid than in the case of diamond, which was exposed to naturally. In practice, the same wavelength of radiation and means against which the deposits can be used for detection as artificial irradiation (with effect on one edge of the scale), and ion bombardment (with effect at the other end of the scale), and for this reason, it is possible to show on the screen, was the diamond artificially irradiated or if the diamond is subjected to ion bombardment. The difference between treatment with high energy electrons, which have a penetration depth of several millimeters and fast neutrons, which have a penetration depth of several centimeters, may be detected, but only for a diamond with the size of depth greater than 2-3 mm

Although the detection of irradiation or ion bombardment is detected primarily on rough diamonds, the method according to the present invention can also be used for identification of polished diamonds artificially irradiated or subjected to ion bombardment. When polished naturally irradiated stone shape stone is changed, and the depth of the irradiated material is no longer homogeneous. In the case of a polished diamond, which artificially irradiated or exposed to ionic bombardment, after it is polished, if the change in luminescence intensity with depth is measured from a number of points on the diamond, it will be found that it is homogeneous with respect to the polished surface, which clearly indicates that irradiation is artificial.

For the Elektrownia artificial irradiation or ion bombardment cannot use the line N3 zero background since there is no systematic variation of the parameters of this line. However, it can be used stimulating radiation of any wavelength capable of inducing luminescence from the optical center GR1. System GR1 (General Radiation 1) is a spectroscopic characteristic of a diamond, which is the main sharp line at 741 nm, thanks to the electronic transition at the center of the vacancy in diamond. Absorbing analogue of this system causes a green-blue color. If the optical center GR1 stir, at room temperature, the light in the wavelength range from 500 nm to 740 nm, it causes the luminescence with a strong line at 741 nm. Thus, the stimulating radiation is preferably a radiation with wavelengths from about 500 to about 740, for example, about 633 nm and detected luminescence containing wavelengths from about 740 to about 745 nm.

If the diamond is a doublet, there is a change in luminescence when the detection reaches a depth where there is a change from natural to synthetic material, or Vice versa.

For detection of doublets optical center GR1 cannot be used, but can be detected changes in the line N3 zero background. Stimulating radiation is preferably a radiation with a wavelength of about is about 300 to 400, for example, approximately 325 nm, and detected luminescence from about 330 to about 450 nm. However, changing the speed of decreasing the Raman signal with depth, due to differential absorption of the stimulating radiation may, alternatively, be used to indicate changes in the material, which consists of a diamond.

The whole procedure is automated. The technique can be used to detect artificial irradiation or ion bombardment in diamonds, much less about than 10 points (0,1 carat weight, although they preferably comprise at least 1 mm in depth. The present invention can be used for detection of doublets in diamonds, down, around, up to ten points (0,1 carat weight, and possibly less.

If the stimulating radiation is able to penetrate the entire depth of the diamond is focused in the depth of the diamond can be detected luminescence at different values of depth, for example, by exception, essentially, detecting luminescence, which in essence is not in the focal plane. This method is a confocal technique using confocal spectrometer. Confocal aperture, placed in the back focal plane of the microscope, ensures that only fluorescent who ncia from the focal point of the lens reaches the detector of the spectrometer. Luminescence from other parts of the sample does not pass through the confocal aperture and, thus, is not detected. The area of the selected region depends on the diameter of the confocal aperture and magnification of a micro. The luminescence is collected from the volume, now consisting of the selected area defined by the diameter of the confocal aperture and magnification of the lens, and the focal depth of the lens is determined by its numerical aperture.

Despite the fact that this method usually carried out at room temperature, can be used and lower temperatures, with the use of the cryostat, such as Microstat N, from Oxford Instruments.

The present invention will be described, as an example, with reference to the accompanying drawings, on which:

figure 1 is a schematic vertical cross section of the device in accordance with the present invention, illustrating a polished diamond, which is estimated in accordance with the method of the present invention;

figure 2 is a block diagram of the device in figure 1;

figure 3 is an algorithm illustrating the software of the device according to figure 1;

figure 4a depicts the spectra of luminescence GR1 on the surface and at depth increments of 10 μm under the surface is th rough diamond exposed natural alpha-irradiation;

figure 4b corresponds to figure 4a, but shows the normalized integrated intensity of luminescence GR1;

figure 5 corresponds to figure 4b, but a diamond is a diamond, subjected to artificial electron irradiation;

figure 6 corresponds to figures 4b and 5, but a diamond is a diamond, subjected to artificial ion implantation;

figure 7 is a spectrum of photoluminescence/Raman spectrum of a typical natural diamond type 1a;

figure 8 corresponds to figure 7, but a diamond is a diamond obtained by CVD (chemical vapour deposition);

figure 9a represents the dependence on depth, normalized to the integral luminescence intensity N3, for the first doublet, the distance represents the distance by which to move the diamond doublet;

figure 9b corresponds to figure 9a, but the depth is a distance by which to move the focal plane inside the diamond doublet;

figure 10a represents the dependence on depth, normalized to the integral luminescence intensity N3, for the second doublet, the distance represents the distance by which to move the diamond doublet;

figure 10b according to the opment of figure 10a, but the depth displacement is the distance by which to move the focal plane inside the diamond doublet.

In figure 1 for convenience depicted polished diamond 1. However, the diamond 1 can be a rough diamond or cut in half, rough diamond, rough diamond can be supported using legkodeformiruemyh material, such as "Blu-Tak". Can be practical limitations regarding the surface texture rough diamonds or sawn halves, and the subsequent scattering of x-rays, but in other respects, the present technique is equally applicable to rough diamonds or sawn halves and polished diamonds. The exact location of the surface is determined not physically, but change detectable luminescence. Diamond 1 is placed on the mandrel or table 2, under confocal microscope 3, table 2 is normal to the optical axis. Shows table 2 is designed to receive a piece of polished diamond 1, but it can be designed for standard jewelry such as a ring; alternatively, a piece of jewelry can be supported using legkodeformiruemyh material, as described above. Typically, the area of the diamond 1 to be exhibited and to be located on the standards movement is practical axis. Although it is not illustrated, table 2 is located on the table which can be moved up and down using a stepper motor. The microscope has 3 lens 4 lens and confocal aperture 5. Over the microscope 3 includes a separator 6 beam, the laser 7 for irradiating the diamond 1, the spectrometer 8 and the controller 9. All items are illustrated solely schematically.

Confocal aperture 5 prevents light from outside the focal region in the spectrometer 8. Instant focal plane is indicated by the position 10, and the system is designed so that the focal plane 10 can be scanned directly through the diamond from the top point (here the space 11 of the diamond) to lowest point (here the top 12). Scanning is most conveniently be accomplished by vertical movement of the table 2 at specified intervals, for example, 10 μm or 100 μm. The laser beam is refracted when it enters the diamond 1, and, for this reason, the distance traveled by the focal point of the laser (within diamond 1), at a wavelength of, for example, 633 nm, is approximately 2.41 times greater than the distance traveled by the diamond 1 (2,41 is the refractive index of diamond at 633 nm), or approximately 2.51 times higher at a wavelength of 325 nm (of 2.51 is the refractive index of diamond at 325 nm).

Figure 2

The block diagram in figure 2 depicts the elements 38, in confocal spectrometer associated with the microscope 13 and having a detector 14 on the basis of a matrix of charge-coupled for detecting luminescence (actually, part of the spectrometer 8). The CPU 9 shown with the monitor 15 to display the detected results. Table 2 shows how the three-coordinate table, bearing matrix 2a of the samples diamonds (say 5 x 5), axes x, y (horizontal plane) are intended for positioning under the microscope 13 diamond of the matrix 2a of the samples. Moving along the z axis represents the vertical movement described above.

Figure 3

The block diagram in figure 3 is, in General, self-sufficient and is not described further in detail. Stage "data Processing" includes the analysis of the rate of change in luminescence with depth, to determine the boundaries or changes in the material.

Examples of detection of artificial irradiation and ion bombardment

In one of the usable devices laser 7 is a He-Ne laser with output power of 10-20 MW at a wavelength of 633 nm. Laser 7 can be used with the confocal microscope 3 and the spectrometer 8, as LabRam Infinity Confocal Spectrometer produced JY Horiba. Detected luminescence from about 680 to about 800 nm. In diamond, this system gives all the opportunity to probe the depths from 0 to 500 μm using a lens 4 zoom lens x100 and 50 μm confocal aperture 5. Depth from 0 to 10 mm can senderbase using lens 4 zoom lens x20 and 200 μm confocal aperture 5.

When using this device stage "data Processing" in figure 3 is as follows.

Analyzed the dependence of the normalized integrated intensity of Raman scattering line zero background GR1 from the depths beneath the surface of the sample.

When observing a significant reduction in the above parameter at a depth of less than 10 microns, this diamond is identified as potentially exposed to ion bombardment".

When observing a significant reduction of the above option on the depth from 500 to 2000 microns, this diamond is identified as potentially Exposed to electron irradiation".

If there is no any significant reduction in the above parameter at depths greater than 2000 microns, this diamond is identified as potentially Exposed to neutron irradiation".

If there is a significant decrease of the above parameter at a depth of from 15 to 35 microns, this diamond is identified as "Subjected to natural exposure".

The depth at which a significant decrease can be determined by differentiation of the signal and determine where EIT a minimum, using standard mathematical algorithms. The form of dependence can be compared with the expected form by accessing the stored reference files of the dependencies.

Figures 4a, 4b and 5

Figure 4a depicts the spectrum of photoluminescence/Raman spectrum recorded using confocal spectrometer with lens 4 lens x100 and 50 μm confocal aperture 5. The curves in figure 4a represent the dependencies for different depths below the surface, in this case the curve O is written on the surface. Raman line of diamond is approximately 691 nm and is depicted as a sharp peak intensity. Normalization figure 4b is achieved by relating the integral luminescence intensity GR1 integrated intensity of the Raman lines of the diamond. If the Raman signal decreases to values smaller than 10% from its initial value, it is considered that the focal point of the probe is no longer inside the diamond. By selecting the appropriate grating, detector based on a matrix of charge-coupled position corresponding to the Central wavelength of the grating spectrometer (spectrometer 8), as the signal GR1, and Raman signals can be obtained in the same spectrum. Software, such as the one that comes with the confocal spectrometer LabRam Infinity, to Figuerola to provide the image based on the depth in real time. The processor 9 has the appropriate software for automatic indication of whether a diamond is irradiated naturally or artificially.

The center platform of the diamond 1 is first positioned in the focal point of the laser beam, and the spectra recorded after 10 μm intervals, as the diamond 1 is moved upward, toward the lens 4 lens, which focuses the laser. This process is equivalent to the collection of spectra as the focal point of the laser is scanned within diamond 1, through its space.

As can be seen in figure 4b, for a natural alpha - irradiated diamond, luminescence GR1 is essentially limited in the range of 30 μm from the surface, while (as shown in figure 5) for diamond, artificially irradiated by electrons, luminescence GR1 is significantly intensive at distances greater than 1 mm below the surface (please note different scales of figures 4b and 5).

Figure 6

Figure 6 depicts the normalized integral intensity curve for diamond, subjected to ion bombardment, the dependence different from that depicted in figures 4b and 5, and the scales are very different, and the depth of implantation is very small.

A graph of the normalized integrated intensity of luminescence GR1 for diamond, subjected bombs is jarovce neutrons, should be a horizontal line, again, is different from the spectra of figure 4b and figure 5.

Examples of detection of doublets

In one of the usable devices laser 7 is a He-Cd laser with output power of 10-100 MW at a wavelength of 325 nm. Laser 7 can be used with the confocal microscope 3 and the spectrometer 8 as Infinity Confocal Spectrometer, is JY Horiba. Detected luminescence from about 330 to about 450 nm. In diamond this system allows for the probing depth from 0 to 500 μm, using a lens 4 lens ×100 and 50 µm confocal aperture 5. Depth from 0 to 10 mm can senderbase using lens 4 lens ×20 and 200 μm confocal aperture 5.

Choosing the appropriate grating, a detector based on a matrix of charge-coupled position corresponding to the Central wavelength of the grating spectrometer (spectrometer 8), as the signal GR1, and Raman signals can be obtained in the same spectrum. Software, such as the one that comes with the confocal spectrometer LabRam Infinity, is configured to provide the image based on the depth in real time.

The processor 9 has the appropriate software for automatic indication is l is the diamond doublet. At the stage of "data Processing" figure 3 the software normalizes the integral intensity of the line N3 zero background in relation to the integrated intensity of the Raman lines of the diamond. Analyzed the dependence of the normalized integrated intensity of Raman scattering line N3 zero background from the depths beneath the surface of the sample. If there is a significant decrease or increase in the above setting, the diamond will be mentioned as a possible doublet. If the dependence is almost flat (and nonzero), the diamond will be held as 'not doublet'. As above, if the Raman signal falls below than 10 percent of its initial value, we can assume that the focal point of the probe is no longer in the diamond.

Figure 7

Figure 7 represents a typical spectrum of the photoluminescence/Raman spectrum for natural diamond type 1a collected confocal, at room temperature, excitation 325 nm He-Cd laser. It contains the line N3 zero background, 415 nm, together with the associated oscillatory structure at larger wavelengths. More than 95% of all natural diamonds have a line N3 zero background; those who do not have it, are in advance. The spectrum also contains a Raman line, approximately 339 nm, depicted as a sharp peak intensity.

Fig is RA 8

Figure 8 is a similar range for synthetic diamond, obtained via CVD. It does not contain line N3 zero background at 415 nm or related to electron-vibrational structure.

Figures 9a and 9b

Figures 9a and 9b depict measured using a confocal microscope according to the depth, normalized luminescence N3, for the first doublet, which is prepared only for experimental purposes. The first doublet is a round diamond, partially consisting of natural diamond type 1a, and partly from synthetic diamond, obtained via CVD. He has a crown of synthetic diamond obtained by CVD, and the boundary between this component and the component of natural diamond, as it is known, is 0.86 mm below ground, while the total depth of the stone is 3,19 mm

The center of the ground doublet 1 is first positioned in the focal point of the laser beam and the spectra recorded after 100 µm intervals, as doublet 1 is moved upward, toward the lens 4 lens, which focuses the laser. This process is equivalent to the collection of spectra as the focal point of the laser is scanned in the doublet 1, through the area of the diamond.

As described above, the distance traveled by the focal point of the laser inside the stone is approximately the nutrient 2.51 times higher than the distance traveled by the stone. In figure 9a, the horizontal axis represents the distance traveled by the stone, from a position in which the site is located in the focal point of the laser. In figure 9b, the horizontal axis represents the distance multiplied by of 2.51. This approximately corresponds to the depth position of the focal point of the laser beam under the deck of the diamond.

The change in the graphs of figures 9a and 9b is not sharp due to the relatively poor resolution at those depths, which zenderoudi, and intervals between measurements. However, the exact depth of the boundary is usually not a problem, but only that there is a boundary or not.

Figures 10a and 10b

Figures 10a and 10b almost correspond to figures 9a and 9b, but represent the spectra for the second doublet, which also form only for experimental purposes. The second doublet is a round diamond, partially consisting of natural diamond type 1a and partly from the diamond obtained by CVD. He has a crown of natural diamond type 1a, and the boundary between this component and the component synthetic diamond obtained by CVD, is 0.75 mm lower than the Playground, while the total depth of the stone is 1,64 mm

The second doublet positioned the same way as for the first doublet in figures the x 9a and 9b.

Unless the context clearly requires otherwise, in the present description and in the claims the word "comprise", "comprising" and the like should be considered as comprising opposed to an exclusive or exhaustive sense; that is to say, in the sense of "including, but not limited to".

The present invention is described above by way of example, and modifications can be made within the context of the present invention.

1. Device for automatic indication of changes in the material inside diamond jewelry, contains a means of irradiation of a diamond to stimulate the emission of luminescence, thus stimulating radiation is able to penetrate through the entire depth of the diamond tools for automatic detection of luminescence at different depths in the depth of the diamond; excluding luminescence, which is not in the focal plane and the focal plane can be scanned directly through the diamond from the top point to the bottom point of the diamond, means for automatically comparing the values of the luminescence detected by the depth in such a way that ensures the detection of changes in the material, which consists of diamond, and means reacting to the specified comparison comparison tools designed and DL is an automatic indication of the change in the material.

2. The device according to claim 1, which is detected and compared the intensity of the spectral characteristics of the luminescence.

3. The device according to claim 1, in which the detection means are arranged so that the depth at which the detected luminescence, it is automatically moved to the specified increment.

4. The device according to claim 1 in which the means for automatically comparing includes software for analyzing the rate of change in luminescence with depth, to identify the boundaries or changes in the material.

5. Device according to any one of the preceding paragraphs, in which the stimulating radiation is focused at the depth of the diamond and the luminescence is recorded by collecting luminescence from these different depths.

6. The device according to claim 5, which is linked to the implementation of the technology, which essentially prevents the detection of luminescence, which is not in the focal plane, at the depth indicated.

7. The device according to claim 5, which is linked to the implementation of confocal technology.

8. The device according to claim 5 in which the means of detection include confocal spectrometer.

9. The device according to claim 1, in which the detected luminescence is normalized by its correlation with the characteristic emission of luminescence of all diamonds.

10. The device according to claim 9, in which the specified characteristic emission of luminescence is a Raman scattering.

11. The device according to claim 1, which is performed with the possibility of indicating whether the diamond artificially irradiated to change its color, this means the display indicate whether the diamond artificially irradiated.

12. The device according to claim 5, which is performed with the possibility of indicating whether the diamond artificially irradiated to change its color, this means the display indicate whether the diamond artificially irradiated.

13. The device according to item 12, which is carried out using confocal techniques.

14. The device according to claim 1, which is performed with the possibility of indicating whether the diamond is subjected to ion bombardment to change its color, this means the display indicate whether the diamond is subjected to ion bombardment.

15. The device according to claim 5, which is performed with the possibility of indicating whether the diamond is subjected to ion bombardment to change its color, this means the display indicate whether the diamond is subjected to ion bombardment.

16. The device according to item 15, which is carried out using confocal techniques.

17. The device according to claim 1, which vol is Leno with the possibility of indication, was this diamond artificially irradiated to change its color, this means the display indicate whether the diamond artificially irradiated, or made with the possibility of indicating whether the diamond is subjected to ion bombardment to change its color, this means the display indicate whether the diamond artificially irradiated, which means exposure cause the luminescence from the optical center GR1.

18. The device according to claim 5, which is performed with the possibility of indicating whether the diamond artificially irradiated to change its color, this means the display indicate whether the diamond artificially irradiated, or made with the possibility of indicating whether the diamond is subjected horse bombardment to change its color, this means the display indicate whether the diamond artificially irradiated, which means exposure cause the luminescence from the optical center GR1.

19. Device according to any one of claims 1 to 4, 9-11, 14, and 17, in which the stimulating radiation is a radiation with a wavelength of from about 500 to about 740 nm.

20. The device according to claim 5, which is performed with the possibility of indicating whether the diamond artificially irradiated to change its color, with means of indication indie is irout, if the diamond artificially irradiated, and/or performed with the possibility of indicating whether the diamond is subjected to ion bombardment to change its color, this means the display indicate whether the diamond is subjected to ion bombardment, and the stimulating radiation is a radiation with a wavelength of from about 500 to about 740 nm.

21. The device according to claim 19, in which the stimulating radiation is a radiation at a wavelength of about 633 nm.

22. The device according to claim 20, in which the stimulating radiation is a radiation at a wavelength of about 633 nm.

23. Device according to any one of claims 1 to 4, 9-11, 14, and 17, in which the detected luminescence at a wavelength of from about 680 to about 800 nm.

24. The device according to claim 5, in which the detected luminescence at a wavelength of from about 680 to about 800 nm.

25. The device according to claim 1, which is performed with the possibility of indicating whether a diamond is natural/synthetic doublet.

26. The device according to item 15, which is carried out using confocal techniques.

27. The device according to claim 5, which is performed with the possibility of indicating whether a diamond is natural/synthetic doublet.

28. The device according to claim 1 in which the means of exposure cause the optical luminescence what about the Central N3, causing the line N3 zero background.

29. The device according to claim 5 in which the means of exposure cause the luminescence optical center N3, causing the line N3 zero background.

30. Device according to any one of claims 1 to 4, 9, 10, 25, and 28, in which the stimulating radiation is a radiation with wavelengths from about 300 to about 400 nm.

31. The device according to claim 5, in which the stimulating radiation is a radiation with wavelengths from about 300 to about 400 nm.

32. The device according to item 30, in which the stimulating radiation is a radiation with a wavelength of about 325 nm.

33. The device according to p, in which the stimulating radiation is a radiation with a wavelength of about 325 nm.

34. The device according to item 30, in which the detected luminescence at wavelengths of from about 330 to about 450 nm.

35. The device according to p, in which the detected luminescence at wavelengths of from about 330 to about 450 nm.

36. The device according to item 30, in which the detected luminescence at wavelengths of from about 330 to about 450 nm.

37. The device according to p, in which the detected luminescence at wavelengths of from about 330 to about 450 nm.

38. The method of assessing the quality of diamond jewelry, for detecting whether there is a change in the material inside the diamond, including ispolzovaniya according to any one of claims 1 to 4, 9-11, 14, 17, 25 and 28, where the change in material is displayed automatically.

39. The method of assessing the quality of diamond jewelry to determine whether there is a change in the material inside the diamond, including the use of the device according to claim 5, where the change in material is displayed automatically.

40. The method according to § 39, which is carried out using confocal techniques.

41. The method according to § 38, in which the diamond is a polished precious diamond.

42. The method according to § 39, in which the diamond is a polished precious diamond.

43. The method according to p, in which the diamond is a polished precious diamond.



 

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Scope // 2300095

FIELD: visual scope of mark onto face of precious stone.

SUBSTANCE: device for observing information mark on face 7 of precious stone 6 is made in form of casing 1 for jewelry. Casing 1 for jewelry has substrate 2 to keep ring 5 with precious stone 6 on top of it and rotating cap 3. Rotating cap 3 has opening 15 in its top part; opening has 10x lens 16, that's why when cap 3 is open and turned by 30° angle, face of 7 of precious stone can be seen through lens 18. Moreover precious stone is illuminated by light that enters casing through slot formed when cap is opened. Light falls onto face slantwise and is regularly reflected through lens 16. Scope can be used for internal and external observation.

EFFECT: simplicity at use; improved comfort.

38 cl, 4 dwg

FIELD: laser machine for analysis, grading and marking-out of untreated diamond.

SUBSTANCE: the machine has a laser scanning device, three-dimensional scanning system, matrix, masking device, electronic unit and a computer program for analysis of the diamond weight and characteristics of the brilliant or brilliants that can be obtained from an untreated diamond.

EFFECT: saved material and time, and enhanced capacity.

30 cl, 15 dwg

FIELD: physics.

SUBSTANCE: present invention relates to the method and system for laser marking precious stones and, particularly to the method and system for engraving authentication codes. In the system for laser marking precious stones such as diamonds, marks consist of several microscopic dots, increase of which can be initiated upon effect on natural internal defects or impurities inside the precious stone of a strictly focused laser pulse sequence. The marks are inscribed by laser pulses, carrying significantly less energy than threshold energy required for inscription inside ideal material of precious stone. The method of laser marking and encryption takes into account random spatial distribution of defects, present in natural precious stones, as well as their much localised character. Authentication data are encrypted in the precious stone in the relative spatial arrangement of dots which form a mark. Dots, engraved under the surface of the precious stone, can be made undetectable to the naked eye and a magnifier through limiting their individual size to several micrometres. The mark can be detected using a special optical reading device.

EFFECT: laser inscription of permanent point marks inside precious stones.

40 cl, 14 dwg

FIELD: mining.

SUBSTANCE: invention relates to artificail gem diamonds identifiable with a certain person or animal. A personalised gem diamond is grown from a charge that includes carbon being a product of carbonisation of the material provided by the customer, powder of spectroscopically pure graphite and a marker for which at least two elements are used that are selected from a lanthanide group and taken in a arbitrarily prescribed ratio to the extent between 0.01 to 10 mcg /g.

EFFECT: improved authenticity of identification of a personalised diamond.

1 ex, 3 dwg

FIELD: physics.

SUBSTANCE: invention relates to devices which use ultraviolet radiation for testing objects, and is meant for sorting diamonds and, particularly for selecting diamonds from natural rough diamonds and cut diamonds with brown hue, where the selected diamonds are suitable for high-temperature processing at high pressure for decolouring, more specifically, type IIa and IIb, and IaB diamond crystals. A light-emitting diode with radiation peak in the wavelength range from 240 to 300 nm is used as the ultraviolet radiation source, and the detector of radiation transmitted through the tested diamond crystal is a photodiode. The electric signal from the photodiode is amplified with a converting amplifier. Intensity of radiation transmitted through the tested diamond crystal is indicated using a measuring device and in parallel using an indicator with operation threshold. The light-emitting diode is placed in a holder with a table. A narrow central hole is made in the table in order to pass radiation from the light-emitting diode. The tested diamond crystal is placed on the table, while completely covering this hole. The diametre of this hole is made smaller than typical dimensions of the tested diamond crystal. The photodiode is placed into the holder with possibility of changing its position relative the tested diamond crystal and possibility of fixing its vertical position, in line with the hole in the table, using a special detachable cover for the said table.

EFFECT: design of a mobile compact device for selecting diamond crystals, related to types IIa and IIb, and IaB, from rough diamonds or cut diamonds, suitable for decolouring and quality improvement through thermobaric processing.

2 cl, 2 dwg

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