# Diamond faceting

FIELD: process engineering.

SUBSTANCE: invention is intended for use in production of jewellery. Proposed method consists in diamond site shaping to cone with cone generatrix angle to girdle plane. Diamond faceting features the following parameters: diamond diameter D, total height H=0.61D, cone base d=0.52D, girdle depth r=0.04D, top height with girdle h1=0.22D, bottom height to girdle h2,=0.39D, inclination of top faces to girdle plane 23.5°, bottom inclination to girdle plane 38.5°, cone generatrix inclination to girdle - 17°.

EFFECT: perfected diamond dye play.

1 dwg

The invention relates to the processing of diamond crystals and can be used in the diamond manufacturing industry.

Known cut diamonds with geometry, calculated M Tolkowsky providing optimal light game and luster of diamond [1].

The disadvantages specified cut can be attributed to weak color game of the diamond.

Known invention "Method for color cut diamond", patent No. 2453256, priority from 18.08.2008,

The disadvantages of this method include low color game of the diamond and the difficulty in accurately performing all of the geometric dimensions of the diamond.

It is known that when light travels from one medium to another is the refraction of the rays. The refractive index N=sinα/sinβ, where α is the angle between the perpendicular to the plane of the partition and the incident beam, and β is the angle between the refracted ray and the normal to the plane of the partition. Light rays entering perpendicular to the ground, almost not refracted and five internal reflection of the light flux does not give the desired effect.

The challenge, which seeks the claimed technical solution is to increase the color game of the diamond.

The result provided the solution to this problem is that you created a way to cut a diamond, in which the area of a diamond in the Supplement in the form of a cone, with the angle of the generatrix of the cone to the plane of the girdle, equal to 17 degrees, with the specified cut provides the following options:

diamond diameter D;

the total height H=0,61 D;

the size of the base of the cone d=0,52 D;

the thickness of the girdle r=0,04 D;

the height of the top of the girdle h1=0,22 D;

the height of the bottom to the girdle h2=0,39 D;

the angle of the sides of the top to the plane of the girdle 23,5°;

the angle of inclination of the faces of the bottom to the plane of the girdle of 38.5°;

the angle of inclination of the generatrix of the cone to the plane of the girdle 17°.

It is known that the refractive index of diamond for different wavelengths different:

- for the red color wavelength 687 μm, the refractive index 2,402;

- violet wavelength 397 μm, the refractive index - 2,465;

the other colors of the spectrum are in the middle of the specified range.

When hit by the light beam on the plane of a diamond is its decomposition into its constituent colors of the spectrum. The width of the decomposition of the color spectrum is determined by the angle between the refracted rays of red and purple.

The proposed method is as follows.

In Fig.1 shows a drawing of a diamond, where instead of the site of the diamond is the cone angle of the generatrix of the cone to the plane of the girdle, equal to 17 degrees. Almost all of the light rays with angles from the top of the stake is and perpendicular to the plane of the cone (partition) are refracted in accordance with N=sinα/sinβ, moreover, the width of the decomposition of the color spectrum is more than 1/2 degree. Light rays with angles from the perpendicular to the plane of the cone to the base of the cone does not affect the refracted rays. Possible variations change the angle of 17 degrees.

The implementation of the invention is produced in accordance with the technological process of manufacturing of diamonds.

Literature used:

1. Epifanov Century. And. processing Technology diamonds Moscow, Higher school, 1982

Method cut diamond, characterized in that the area of the diamond are in the form of a cone with the angle of the generatrix of the cone to the plane of the girdle, with the specified cut provide the following parameters:
diamond diameter D;
the total height H=0,61 D;
the size of the base of the cone d=0,52 D;
the thickness of the girdle r=0,04 D;
the height of the top of the girdle h1=0,22 D;
the height of the bottom to the girdle h2=0,39 D;
the angle of the sides of the top to the plane of the girdle 23,5°;
the angle of inclination of the faces of the bottom to the plane of the girdle of 38.5°;
the angle of inclination of the generatrix of the cone to the plane of the girdle 17°.

Same patents:

FIELD: chemistry.

SUBSTANCE: method includes the placement of a workpiece of a mineral of a required geometrical shape in a vacuum chamber with the further impact on the entire surface of the workpiece by scanning pulse laser radiation with the density of laser radiation q=1.5×102÷2.0×102 W/cm2, duration of the laser pulse 1÷3 ms with the pulse repetition frequency of 1÷5 Hz, at a rate of laser radiation scanning of 0.2÷1 mm/s.

EFFECT: increase of medicinal properties of minerals of an amphibole group in case of their application in the manufacture of massagers.

FIELD: chemistry.

SUBSTANCE: present invention relates to a suspension containing a set of abrasive grains and binder. The suspension containing a set of abrasive grains and binder is characterised by that the particle size fraction D40-D60 of said set of abrasive grains comprises more than 15 vol.% and less than 80 vol.% of grains having a circularity of less than 0.85, the percentiles D40 and D60 being the percentiles of the cumulative particle size distribution curve of grain sizes corresponding to the grain sizes enabling the separation of the fractions consisting of 40 and 60 vol.% of the grains having the largest size, respectively; and the abrasive grains are more than 25% and less than 46% of the weight of said suspension. Also disclosed is an abrasive wire, a method of sawing a block based on silicon oxide and a method of machining an ingot.

EFFECT: disclosed suspension provides high rate of sawing, enables to produce wafers, particularly silicon wafers, having a very small thickness, of the order of 100 mcm, with a low reject rate.

15 cl, 6 tbl, 1 dwg

FIELD: engines and pumps.

SUBSTANCE: plunger pair and metering pump comprises at least one external part of crystal based on aluminium oxide alpha-modification and at least one internal part of crystal based on aluminium oxide alpha-modification, preferably, leucosapphire with working surface roughness Ra2÷5Å. Said surface smoothness is brought about by processing the cylindrical surfaces of part of crystal based on aluminium oxide alpha-modification. This method comprises drilling the preliminary blanks of part of crystal based on aluminium oxide alpha-modification with the help of diamond tool. Three-stage mechanical processing is performed by diamond tool with lubricant-coolants and sequential decreased in abrasive grain size to 125/100 and/or 100/80 mcm. Internal strain is removed from blanks by annealing at muffle furnace. Surface is processed by semisoft or soft grinding wheel or by lap with diamond 5/3 mcm or 1/0 mcm grain on clock oil. Tribochemical finishing of the surface is performed by colloidal SiO2-based composition.

EFFECT: longer life, higher metering precision.

12 cl

FIELD: personal use articles.

SUBSTANCE: invention is designed for being used in jewellery industry. The method for faceting diamonds with a culet involves faceting of a round-shaped diamond faceted so that to form a culet. Within the culet, one grinds out and polishes arc-shaped grooves from opposite edges of the diamond bottom facets. The arc-shaped grooves have a section angle equal to 41°.

EFFECT: ensuring complete reflection of light from the culet thus creating additional brilliance of the stone.

2 dwg

FIELD: personal use articles.

SUBSTANCE: invention is designed for being used in jewellery industry. The method for faceting diamonds with a culet involves faceting of a round-shaped diamond faceted so that to form a culet; within the culet, one grinds out and polishes an internal pyramid with a polygon-shaped base the sides whereof are parallel to those of the culet polygon. The pyramid is ground out and polished at the angle between opposite sides equal to 98.5°.

EFFECT: ensuring complete reflection of sunbeams from the culet thus creating additional brilliance of the stone.

2 dwg

Cleaning of amber // 2486970

FIELD: process engineering.

SUBSTANCE: invention relates to extraction and processing of fossil resins and may be used for industrial cleaning of amber. Proposed method comprises treatment of amber by organic solvent, namely, tetrahydrofuran or its water solution at content of tetrahydrofuran over 30 wt %, and flushing the amber with water. Treatment by organic solvent is carried out at 20-50°C for 3-25 minutes while flushing is performed under pressure with additional exposure to ultrasound.

EFFECT: higher quality of cleaning, simplified process.

6 cl

FIELD: process engineering.

SUBSTANCE: invention is intended for use in production of jewelry. Proposed method comprises faceting round diamond to form a culet. Inner taper with solid angle of 98.5° is ground and polished in said culet.

EFFECT: complete reflection of light from cullet to create extra stone brilliance.

2 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to production of amber half-stock, primarily, of minor fractions and large-size amber articles and work pieces. Proposed method consists in loading amber stock in elastic shell made from waterproof material to be sealed and placed in hydro barometric chamber. The latter is filled with fluid. Elastic shell filled with amber stock is subjected to hydrostatic compression at high fluid pressure. Note here that temperature inside said chamber is kept not higher than 120°C during the entire period of hydrostatic effects.

EFFECT: production of large-size amber articles with normal physical, chemical, aesthetic and therapeutic qualities of natural monolithic amber, recovery of industrial wastes, cheap amber half-stock.

4 cl

FIELD: physics.

SUBSTANCE: inside a diamond, in the region free from optically impermeable irregularities, an image is formed, which consists of a given number of optically permeable elements of micrometre or submicrometer size, which are clusters of N-V centres which fluoresce in exciting radiation, wherein formation of clusters of N-V centres is carried out by performing the following operations: treating the diamond with working optical radiation focused in the focal region lying in the region of the assumed region where the cluster of N-V centres is located, while feeding working ultrashort radiation pulses which enable to form a cluster of vacancies in said focal region and which provide integral fluence in said focal region lower than threshold fluence, where there is local conversion of the diamond to graphite or another non-diamond form of carbon; annealing at least said assumed regions where clusters of N-V centres are located, which provide in said regions drift of the formed vacancies and formation of N-V centres, grouped into clusters in the same regions as the clusters of vacancies; controlling the formed image elements based on detection of fluorescence of N-V centres by exposing at least regions where image elements are located to exciting optical radiation, which enables to excite N-V centres and form a digital and/or a three-dimensional model of the formed image. Images formed in diamond crystals from clusters of N-V centres are visible to the naked eye, by a magnifying glass and any optical or electronic microscope.

EFFECT: image from a cluster of N-V centres is inside the crystal, cannot be removed by polishing and is therefore a reliable diamond signature and reliable recording of information without destroying or damaging the crystal itself.

46 cl, 3 dwg

FIELD: process engineering.

SUBSTANCE: invention is intended for used in production of jewelry. Proposed method consists in that the angle between opposite faces is made equal to 77°. Note here that faceting features the following parameters: diamond diameter D, total height H=0.76 D, site size d=0.67 D, girdle thickness r=0.08 D, height of top with girdle h1=0.11 D, height of bottom to girdle h2=0.65 D, height of bottom face twist h3=0.42 D, top inclination to girdle plane 10°, bottom inclination to girdle plane: ahead of twist 51.5°, behind twist 55°.

EFFECT: fivefold internal reflection of light rays and increased dispersion.

1 dwg

FIELD: process engineering.

SUBSTANCE: decorative composite body (1) comprises glass body (2) and polymer (3) to cover partially said glass body (2). Portion of glass body surface is located on outer surface of decorative composite body (1). Note here that at least two adjacent areas (8) of glass and polymer material (3) on composite body (1) outer side are ground in as-boded state. Glass body (2) areas verging on polymer material (3) are provided, at least partially, with mirror coat.

EFFECT: ruled out air bubbles and optical defects.

21 cl, 22 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to technology of production of synthetic diamond material, which can be applied in electronic devices. Diamond material contains single substituting nitrogen $(Ns0)$ in concentration more than 0.5 ppm and having such complete integral absorption in visible area from 350 nm to 750 nm, that at least nearly 35% of absorption is attributed to $Ns0.$ Diamond material is obtained by chemical deposition from vapour or gas phase (CVD) on substrate in synthesis medium, which contains nitrogen in atomic concentration from nearly 0.4 ppm to nearly 50 ppm, and gas-source contains: atomic part of hydrogen, Hf from nearly 0.40 to nearly 0.75, atom part of carbon, Cf, from nearly 0.15 to nearly 0.30; atomic part of oxygen, Of, from nearly -.13 to nearly 0.40; and Hf+Cf+Of=1; ratio of atomic part of carbon to atomic part of oxygen, Cf:Of, satisfy the ratio nearly 0.45:1<Cf:Of< nearly 1.25:1; and gas-source contains atoms of hydrogen, added in form of hydrogen molecules, H2, with atomic part of the total quantity of present atoms of hydrogen, oxygen and carbon between 0.05 and 0.40; and atomic parts of Hf, Cf and Of represent parts from the total quantity of atoms of hydrogen, oxygen and carbon, present in gas-source.

EFFECT: invention makes it possible to obtain diamond material with rather high content of nitrogen, which is evenly distributed, and which is free of other defects, which provides its electronic properties.

17 cl, 11 dwg, 6 ex

FIELD: metallurgy.

SUBSTANCE: monocrystalline diamond material that has been grown using a CVD method and has concentration of single substituent nitrogen [Ns0] of less than 5 ppm is irradiated to introduce isolated vacancies V to at least some part of the provided CVD-diamond material so that total concentration of isolated vacancies [VT] in the obtained diamond material is at least more than (a) 0.5 ppm and (b) by 50% more than concentration [Ns0] in ppm in the provided diamond material; after that, annealing of the obtained diamond material is performed so that chains of vacancies can be formed from at least some of the introduced isolated vacancies at the temperature of at least 700°C and maximum 900°C during the period of at least 2 hours; with that, irradiation and annealing stages reduce the concentration of isolated vacancies in diamond material, due to which concentration of isolated vacancies in the irradiated and annealed diamond material is <0.3 ppm.

EFFECT: diamonds obtain fancifully orange colour during such treatment.

16 cl, 3 dwg, 4 tbl

FIELD: personal use articles.

SUBSTANCE: invention is designed for being used in jewellery industry. The method for faceting diamonds with a culet involves faceting of a round-shaped diamond faceted so that to form a culet. Within the culet, one grinds out and polishes arc-shaped grooves from opposite edges of the diamond bottom facets. The arc-shaped grooves have a section angle equal to 41°.

EFFECT: ensuring complete reflection of light from the culet thus creating additional brilliance of the stone.

2 dwg

FIELD: personal use articles.

SUBSTANCE: invention is designed for being used in jewellery industry. The method for faceting diamonds with a culet involves faceting of a round-shaped diamond faceted so that to form a culet; within the culet, one grinds out and polishes an internal pyramid with a polygon-shaped base the sides whereof are parallel to those of the culet polygon. The pyramid is ground out and polished at the angle between opposite sides equal to 98.5°.

EFFECT: ensuring complete reflection of sunbeams from the culet thus creating additional brilliance of the stone.

2 dwg

FIELD: process engineering.

SUBSTANCE: invention is intended for use in production of jewelry. Proposed method comprises faceting round diamond to form a culet. Inner taper with solid angle of 98.5° is ground and polished in said culet.

EFFECT: complete reflection of light from cullet to create extra stone brilliance.

2 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to processes used in operation at high pressure and modifying substances physically. Proposed method comprises placing diamond in reaction cell in pressure transmitting medium, increasing pressure in reaction chamber and it cooling. Note here that thermal treatment is carried out at temperature increase rate of 10-50°C/s and at 2000-2350°C by passing electric current via heater in cell from programmed power supply source with due allowance for temperature relaxation in said cell in heating. For this, note also that temperature relaxation constant is defined. Said cell is cooled after heating by switching off power supply in forming short diamond heating pulse in temperature range of over 2000°C with diamond total stay time smaller than 30 seconds. Allowance for temperature relaxation in said cell in heating for heating rate Vt and pre-definition of cell temperature relaxation constant τ is made by setting in said programmable power source the maximum temperature of heating to τVT above maximum treatment temperature of 2000-2350°C.

EFFECT: changing colour of low-grate natural diamond without notable graphitisation, high-quality gem diamonds.

2 cl, 5 dwg, 3 ex

FIELD: physics.

SUBSTANCE: inside a diamond, in the region free from optically impermeable irregularities, an image is formed, which consists of a given number of optically permeable elements of micrometre or submicrometer size, which are clusters of N-V centres which fluoresce in exciting radiation, wherein formation of clusters of N-V centres is carried out by performing the following operations: treating the diamond with working optical radiation focused in the focal region lying in the region of the assumed region where the cluster of N-V centres is located, while feeding working ultrashort radiation pulses which enable to form a cluster of vacancies in said focal region and which provide integral fluence in said focal region lower than threshold fluence, where there is local conversion of the diamond to graphite or another non-diamond form of carbon; annealing at least said assumed regions where clusters of N-V centres are located, which provide in said regions drift of the formed vacancies and formation of N-V centres, grouped into clusters in the same regions as the clusters of vacancies; controlling the formed image elements based on detection of fluorescence of N-V centres by exposing at least regions where image elements are located to exciting optical radiation, which enables to excite N-V centres and form a digital and/or a three-dimensional model of the formed image. Images formed in diamond crystals from clusters of N-V centres are visible to the naked eye, by a magnifying glass and any optical or electronic microscope.

EFFECT: image from a cluster of N-V centres is inside the crystal, cannot be removed by polishing and is therefore a reliable diamond signature and reliable recording of information without destroying or damaging the crystal itself.

46 cl, 3 dwg

FIELD: process engineering.

SUBSTANCE: invention is intended for used in production of jewelry. Proposed method consists in that the angle between opposite faces is made equal to 77°. Note here that faceting features the following parameters: diamond diameter D, total height H=0.76 D, site size d=0.67 D, girdle thickness r=0.08 D, height of top with girdle h1=0.11 D, height of bottom to girdle h2=0.65 D, height of bottom face twist h3=0.42 D, top inclination to girdle plane 10°, bottom inclination to girdle plane: ahead of twist 51.5°, behind twist 55°.

EFFECT: fivefold internal reflection of light rays and increased dispersion.

1 dwg

FIELD: metallurgy.

SUBSTANCE: procedure consists in ion-energy-beam processing diamonds with high power ion beam of inert chemical element of helium with dose of radiation within range from 0.2×1016 to 2.0×1017 ion/cm2 eliminating successive thermal annealing.

EFFECT: production of amber-yellow and black colour of diamond resistant to external factors at significant reduction of material and time expenditures of process of diamond upgrading.

1 dwg, 2 ex

FIELD: settings for holding gems.

SUBSTANCE: method comprises setting diamond in the mould so that its base side is in a contact with the bottom side of the top plate and injecting elastomer under pressure that holds the diamond in the clamping ring.

EFFECT: simplified method.

45 cl, 6 dwg