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Invention relates to technology of producing coloured diamond materials, which can be applied as precious stones or cutting instruments. Method includes stages of growing monocrystalline diamond material in accordance with CVD-technology, with diamond material having concentration of single substituting nitrogen atoms [Ns 0] less than 1 ppm; initial CVD-diamond material is colourless, or, in case it is not colourless, then, according to colour gradation brown or yellow, and if it is brown according to colour gradation, then it has level G (brown) of colour gradation or better for diamond stone with 0.5 carat weight with round diamond cut, and if it is yellow according to colour gradation, it has level T (yellow) of colour gradation or better for diamond stone with 0.5 carat weight with round diamond cut, and irradiation of initial CVD-diamond by electrons to introduce isolated vacancies into diamond material in such a way that product of the total concentration of vacancies × way length [Vt]×L, in irradiated diamond material at said stage or after additional processing after irradiation, including annealing irradiated diamond material at temperature at least 300°C and not higher than 600°C, constitutes at least 0.072 ppm cm and not more than 0.36 ppm cm. |
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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°. |
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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. |
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Invention relates to technology of production of synthetic diamond material, which can be applied in electronic devices. Diamond material contains single substituting nitrogen ( N s 0 ) 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 N s 0 . 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. |
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Method for making fancifully coloured orange monocrystalline cvd-diamond, and finished product Monocrystalline diamond material that has been grown using a CVD method and has concentration of single substituent nitrogen [Ns 0] 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 [Ns 0] 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. |
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Method for faceting diamonds with culet 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°. |
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Method for faceting diamonds with culet 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°. |
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Method of faceting diamonds with culet 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. |
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Method of diamond heat treatment 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. |
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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. |
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Method of diamond color faceting 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°. |
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Procedure for production of diamonds of fantasy yellow and black colour 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. |
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Procedure consists in simultaneous growth of multitude of work pieces of moissanite crystals in cellular mould of forming graphite, in dividing them to separate crystals, in faceting, grinding and in polishing. Before faceting, grinding and polishing work pieces are first glued on a mandrel, then they are re-glued on a back side. Moissanite is polished on a ceramic polisher rotating at rate from 200 to 300 rpm with utilisation of diamond powder (spray) with dimension of a grain from 0.125 to 0.45 mcm, facilitating depth of grooves less, than length of light wave of a visible part of spectre. Also, cut and chipped edges of the work piece with defects not suitable for faceting, are crumbled and returned to a stage of growth. Grinding paste with size of a grain 0.25 mcm can be used for grinding. |
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Invention relates to jewellery, namely, to pieces of jewellery made of precious and semiprecious stones. A piece of jewellery comprises a substrate made in the form of a spherical body with smooth outer surface and a core, preferably a pearl, with a radially arranged cone-shaped seat, in which the base is located near the outer surface of the substrate, and the top is located inside the substrate core. The piece of jewellery comprises a smooth or a faceted insert, preferably a precious or a semiprecious stone, made of a pavilion fixed with the help of a fixing agent in the substrate seat, a girdle and a crown. In the substrate core in the area of the seat top along the axis (0-0) of the substrate there is a hole provided, where the top of the insert pavilion is installed. The base of the substrate seat is made with a groove, where the girdle and the crown of the insert are placed. The diameter (d) of the hole made in the substrate core in the area of the seat top along the axis (0-0) of the substrate is selected as equal to 0.1-0.9 of the diameter (D) of the substrate seat base. The diameter (d1) of the substrate seat base deepening is selected as equal to 1.01-1.20 of the diameter (D2) of the insert girdle, and the depth (h) of the substrate seat base deepening is chosen as equal to 0.8-2.0 of the sum of heights (h1+h2) of the girdle (h1) and the crown (h2) of the insert. |
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Procedure for radiation of minerals Procedure for radiation of minerals in neutron flow of reactor in container consists in screening radiated minerals from heat and resonance neutrons. Composition of material and density of the screen is calculated so, that specific activity of radiated minerals upon completion of radiation and conditioning does not exceed 10 Bq/g. Before radiation contents of natural impurities in radiated minerals can be analysed by the method of neutron activation analysis. Only elements activated with resonance neutrons are chosen from natural impurities of radiated minerals. Tantalum and manganese or scandium and/or iron or chromium are used as elements of the screen. Chromium-nickel steel alloyed with materials chosen from a row tantalum, manganese and scandium are used in material of the screen. |
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Diamond for decoration, which has two-stage pavilion Invention is designed for being used in jewellery industry. Diamond for decoration is made in the form of very bright diamond with multiple reflection patterns when it is viewed from above the facet of the platform and facets of diamond crown. Diamond has the same crown as the diamond with round brilliant cut, but its pavilion consists of the first pavilion and the second pavilion, which are separated with horizontal separation line. The second pavilion represents octagonal pyramid and its side edges form the main facets of the second pavilion. The first pavilion represents hexadecagonal truncated pyramid with upper edge on horizontal separation line, and its lateral sides form the first lower facets of girdle. The main facets of the first pavilion spread from girdle and between the first lower facets of girdle, inward between the main facets of the second pavilion. |
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Marked surface of the mark is polished and a processing layer (PL) is deposited, through which an image of the mark (M) is created on the surface in form of a diffraction structure (DS) which is optically visible in reflected light at diffraction angle. The DS is of the reflective phase grating type and is formed through ion etching of the surface together with the PL. Before formation of M on the surface, the DS is formed in the PL in form of a regular microrelief of a sinusoidal profile through ablation of the material of this layer using a pulse of interfering beams of coherent laser radiation. As a result, a DS is formed in the PL with holographic accuracy. The DS is formed through partial removal of material of the PL within its thickness. The image M in form of DS on the marked surface is also formed with holographic accuracy, which is provided through interfering coherent laser beams. The DS formed in the PLS is exposed to an ion beam. The process cycle for forming the M is carried out using a template mask together with the DS which forms the final image of the mark on the surface of the article. |
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Synthetic material for jewellery industry and method of its production Group of inventions relates to materials for jewellery industry, in particular, to synthetic materials that serve to replace natural jewellery stones, and to method of their production. A synthetic coloured or colourless, transparent, semi-transparent or non-transparent composite nanocrystalline material is proposed for jewellery industry on the basis of nanosize oxide and silicate crystalline phases. The material comprises at least one of the crystalline phases listed below: spinel, quartz-like phases, sapphirine, enstatite, petalite-like phase, cordierite, villemite, zircon, rutile, zircon titanate, zircon dioxide. Material colour is provided by ions of transition, rare-earth elements and noble metals in amount from 0.001 to 4 mol%. The method of material production includes melting of initial selected mixture of components at the temperature that is 200-300°C higher than liquidus, cooling of melted material down to the temperature of 1300-1450°C with giving it the necessary shape, baking at the temperature of 640-700°C, when material viscosity is equal to 1010.5-1011 Pa·s, and subsequent additional thermal treatment at the temperature from 680 to 850°C within 1-24 hours, then at the temperature from 900 to 1200°C within 1-24 hours. |
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Identification mark to mark valuable items and valuable item with its application Invention relates to an identification mark to mark valuable items, preferably precious stones, and to a valuable item with its application. The identification mark to mark valuable items is arranged in the form of an optically visualised image formed on a polished surface of the item and arranged as a diffraction structure, in particular, of microstrokes of sinusoidal profile. The diffraction structure is arranged as a reflecting phased diffraction grid, which functionally is a facility to increase contrast and to vary a colour tone of radiation spectrum, at the same time microstructures of the diffraction structure are made at the depth, which does not exceed the permissible value of microirregularities in the generally accepted technology of precious stones polishing. The image of the mark is made with geometrical dimensions, sufficient for its visual perception at the angle of diffraction in the reflected light with the naked eye without additional magnification, at the same time shape and relative space arrangement of microstructures in the diffraction structure are realised with holographic accuracy ensured by means of interfering coherent laser beams. |
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Diamond for adornment, which has two-tier pavilion Invention relates to jewellery industry. A diamond for an adornment is produced as an extremely bright diamond with multiple reflection patterns, when it is examined being above a table facet and facets of the diamond crown. The diamond has the same crown, since it is a diamond with round diamond cut, but its pavilion consists of the first pavilion and the second pavilion separated with a horizontal division plane. Lower facets of a belt and main facets of the pavilion are truncated relative to the horizontal division plane arranged between the first and second pavilion, at the same time the angle of the first pavilion faces is more than the angle of the second pavilion faces inclination. |
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Crude mixture for making artificial stone Crude mixture for making artificial stone contains the following in wt %: semi-white glass 50-70; crystal glass 29.9-49.9; cobalt oxide 0.01-0.15. |
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Crude mixture for making artificial stone Crude mixture for making artificial stone contains the following in wt %: crystal glass 60-70; semi-white packing glass 5-7; cobalt carbonate 0.001-0.005; cerium dioxide 0.001-0.005; incandescent lamp bulb glass - the rest. |
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Superstrong single crystals of cvd-diamond and their three-dimensional growth Method includes placement of crystalline diamond nucleus in heat-absorbing holder made of substance having high melt temperature and high heat conductivity, in order to minimise temperature gradients in direction from edge to edge of diamond growth surface, control of diamond growth surface temperature so that temperature of growing diamond crystals is in the range of approximately 1050-1200°C, growing of diamond single crystal with the help of chemical deposition induced by microwave plasma from gas phase onto surface of diamond growth in deposition chamber, in which atmosphere is characterised by ratio of nitrogen to methane of approximately 4% N2/CH4 and annealing of diamond single crystal so that annealed single crystal of diamond has strength of at least 30 MPa m1/2. |
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Method of embedding mark into diamond, obtained through chemical deposition Method of embedding trade marks or identification marks into monocrystalline diamond material, obtained through chemical gas-phase deposition, involves preparation of a diamond substrate and initial gas, dissociation of the initial gas, which provides the process of homoepitaxial growth of diamond, and to put trade marks or identification marks into synthetic diamond material at least one dopant chemical element selected from a group comprising nitrogen, boron and silicon is introduced into the synthesis process in a controlled manner in form of defect centres which upon excitation emit radiation with characteristic wavelength and in such concentration such that the trade mark or identification mark, under normal observation conditions, should not be easily seen or should not affect the perceived quality of the diamond material, but should be seen or become seen when illuminated with light with wavelength of the excited defect centres, the value of which is less than the said characteristic wavelength of radiation emitted by the defect centres, and visible under observation conditions where the said illumination is not visible to the observer. |
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Identification mark for marking valuables and method of making said mark Invention relates to apparatus and methods of marking valuables, mainly precious stones, particularly cut diamonds, and can be used for subsequent identification of data of the valuables. Mark 1 is made in form of an image, which is optically visualised in diffraction-reflection light, made on the polished surface 3 of the valuable object 2. The structure of the image is formed by a modified area of the surface layer of the object 2 with optical properties in the said area, which is functionally the image of mark 1, altered from the initial properties. The modified area is made in form of microlines 8, spatially formed according to type of the reflection grating, which is functionally an apparatus for increasing contrast of visual perception of the image of marker 1 in at least one of the colour hues of the spectrum of incident radiation. The structure of microlines of the modified area includes at least one impurity additive, which is selected from a group which includes noble metals or boron, ion-implanted into atomic lattices of the initial material of the object without breaking interatomic bonds of these lattices and, therefore, without changing quality of the polished surface of the object, but with change of the complex refractive index of this material. According to the method of making mark 1, before modification, a technological layer (TL) of material, which is removed after modification, is deposited on surface 3. A structure is formed in the technological layer according to type of the line grating. The corresponding area of the surface layer is modified by exposing this area to an ion beam through a mask with an image of mark 1 and the spatial structure formed in the technological layer, that way creating process conditions implantation of modifier ions into the modified area of the surface layer of the material of object 2 without breaking bonds in the atomic lattices of this material and, therefore, without changing initial quality of polishing the surface layer, but with change of its initial optical properties. The modifier used is impurity additives, selected from a group which includes noble metals or boron, ions of which alter the complex refractive index of the modified layer. |
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Personalised grown gem diamond 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. |
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Precious stone and method of its faceting It is received blank of cubic form stone, which is fixed by means of binder in mandrel with peg-shaped jack, so that blank vertex match to the bottom of jack, and its ribs rest walls of jack. Than mandrel is fixed in collet of faceting head and blank is treated according to selected shape of faceting, herewith ajoint of corona and pavilion of stone there are implemented three arched ribs. Precious stone is received from of square blank, contains located in several layers or belts angularly related to each other verges, forming corona and pavilion, at joint of which there are formed three arched ribs. |
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Oval-cut diamond features girdle of elliptic or near-elliptic shape, crown above girdle with octagonal table facet at the crown top, and pavilion below girdle. Girdle side ratio (b/a) is 0.6 or more, where a is radius by longer axis and b is radius by shorter axis. Two main facets of pavilion opposing against central axis have a couple of main crown facets or a couple of star facets positioned opposite to two main pavilion facets over the girdle. Two main pavilion facets, two main crown facets or star facets and table facet have common vertical plane in these facets. |
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Oval cut diamond includes a girdle which has a contour line with the shape of an oval or closer to oval, a crown above the girdle, which has an octagonal tablet facet at the top of the crown, and a pavilion below the girdle. Such a diamond is a modified oval cut diamond, in which the crown and pavilion are turned a sixteenth of the value of the complete angle about their central axis compared to the common brilliant cut diamond. The girdle has ratio (b/a) of the short radius to the long radius of 0.6 or more. In the girdle, the radius in the direction of the long axis is denoted by "a", and the radius in the direction of the short axis is denoted by "b". The pair of main pavilion facets, lying opposite each other about the central axis, has a pair of main crown facets or star-shaped facets, lying opposite pairs of main pavilion facets through the girdle. Two main pavilion facets, two main crown facets or star-shaped facets or tablet facets have a common vertical plane within the limits of the facets. |
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Concrete mix for bead and insert manufacturing for jewellery Concrete mix is intended for manufacturing of beads and inserts for jewellery, imitating 'stone' (rings, cuff links, brooches etc.). Mix includes concrete, process waste of rock crystal and/or citrine and/or amethyst and/or rose quartz, and water. |
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Method of obtaining jewellery personificated diamond Invention allows to obtain memorial diamond from pale-yellow to light-blue tint depending on content of admixture in it, which is identified with exact person and is an object, which reminds of him/her. Method includes processing of biological material belonging to exact individual, and growing on its basis artificial diamond by acting on it with high pressures and temperatures. Processing is performed by mechanical grinding, preliminary drying, chemical processing in hydrochloric acid, chemical processing with complex-former Trilon-B, chemical processing with mixture of mineral acids - hydrofluoric and nitric or sulfuric acids, repeated washing after each chemical processing with said reagents to neutral reaction, filtration and drying until pure highly-dispersive carbon of biological origin is obtained. |
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Diamond of improved rectangular diamond cut Diamond of rectangular cut has beveled facets. Each of said beveled facets adjacent to four apexes of crown has fracture extending along diagonal line parallel to belt so as to form facet configuration wherein beveled facet is divided into lower beveled facet and upper beveled facet. Upper angle of upper beveled facet crown may be made smaller than angle of lower beveled facet crown and, accordingly, even without altering of crown height, so that sign of facet is slightly smaller. Deviation angles of star facets and of second beveled facets from horizontal plane, provided that both are capable of intensive reflection, may be made small, and areas of these facets may be made large. Thus, all reflection patterns become similar in size to the extent that is preferable for visual perception. By making star facets and second beveled facets so that they have small angle of deviation from horizontal plane, extremely intensive reflection may obtained and increased areas of star facet and second beveled facets may be provided. This allows cut to be provided, which is characterized by extremely intensive reflection (the number of visually perceptible beam reflections). |
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Invention relates to preparation of boron-alloyed monocrystalline diamond layers via gas phase chemical precipitation, which can be used in electronics and as jewelry stone. The subject matter is uniformity of summary boron concentration in above-mentioned layer. The latter is formed in one growth sector and characterized by thickness above 100 μm and/or volume exceeding 1 mm3. Boron-alloyed monocrystalline diamond preparation involves diamond substrate provision step, said substrate having surface containing substantially no crystal lattice defects, initial boron source-containing gas preparation step, initial gas decomposition step, and the step comprising homoepitaxial growth of diamond on indicated surface containing substantially no crystal lattice defects. |
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Method of producing colored diamond Method comprises preparing diamond substrate virtually having no defects, preparing the initial gas, decomposing initial gas to produce the atmosphere for synthesis that nitrogen concentration of which ranges from 0.5 to 500 particles per million, and homogeneous epitaxy growth of diamond on the surface. |
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Gem-cutting structure is made in the form of round diamond gem-cut comprising rundist, crown above rundist and pavilion under rundist. Height of rundist is 0.026-0.3 the radius of rundist, angle of pavilion of rundist main facet is ranging between 37.5 deg and 41 deg, and angle of main facet of crown is within the range conforming to the following ratios: c>2.8667xp+134.233 and p<1/4x{sin-1(1/n)+sin-1 (1/n˙sinc))x180/π +180-2c}, where n is diamond diffraction ratio; π is circle constant; p is angle of pavilion, deg; c is angle of crown, deg. Decorative diamond cutting design presents multiplicity of visually perceptible diffracted beams, when observer contemplates diamond on the side of pavilion facet at sight angle less than 20 deg relative to vertical line extending through center of facet of platform. |
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Diamond is made in the form of rectangle with beveled angles and has side faces to be polished. Angles of inclination to rundist plane of crown main faces are 30 deg, of crown paired wedges - 34 deg, of rundist faces - 90 deg, of pavilion main faces - 39 deg, of pavilion wedges - 50 deg, of paired wedges - 45 deg, of angular paired wedges - 41 deg. Diameter of platform is 64%, height of crown is 15%, height of rundist is 2%, depth of pavilion is 43%, total height is 60% of rundist diameter. |
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Proposed method is used for coloring fianites (man-made diamonds) in green, blue and brownish-yellow colors; proposed method may be also used in optics for production of colored light filters withstanding temperatures above 1000°C. Proposed method includes preliminary application of cobalt on fianite surface to be colored and at least one metal whose oxide is liable to spinelle-forming with oxide of bivalent cobalt, iron and/or aluminum, for example. Then material is subjected to heat treatment in oxygen-containing atmosphere at temperature above 1000°C but not exceeding the fianite melting point. The procedure is continued for no less than 3 h. Coat is applied by thermal spraying of metals in vacuum. Said metals may be applied in turn and simultaneously. For obtaining bluish-green color of fianite, cobalt and aluminum are applied at atomic ratio of 1:1 to 1:2. For obtaining yellowish-green color, cobalt, aluminum and iron are applied at atomic ratio of 1:1 :0.1-0.2. For obtaining yellowish-brown color, cobalt and iron are applied at ratio of 1:1 to 1:2. |
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Diamond layer at thickness more than 2 mm is obtained through chemical deposition from gaseous phase. Method includes homo-epitaxial growth of diamond layer on surface of backing at low level of defects in atmosphere containing nitrogen at concentration lesser than 300 billion parts of nitrogen. |
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Personified grown jewelry diamond and method for producing the same Personified grown jewelry diamond comprises heavy metals Sr, Cd, Sn, Ba, Pb, Bi separated from hairs of certain individual or animal, with ratio of concentrations of said metals corresponding to that of said elements in hairs of the given individual or animal. Method involves processing hairs of certain individual or animal by mineralization of hairs at temperature below 550 C until complete decomposition of organic component; forming source for growing of diamond from spectrally pure graphite and hair processing product containing heavy metals Sr, Cd, Sn, Ba, Pb, Bi; growing diamond from melt by seed crystal recrystallization process; determining ratio of concentrations of these elements in grown diamond and comparing with their content in processing product. Jewelry diamond produced has microelements characteristic of certain individual or animal. |
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Method and device for producing mark on gem or diamond surface 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. |
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Decoration with replaceable decorative member Decoration has base with profiled through opening adapted for passage of leg and loop of decorative member pivotally fixed on leg, said leg and loop having shape and sizes corresponding to those of through opening. Fastening device is equipped with blocking member. In preferable version, decoration has at least pair of interchangeable decorative members. |
Another patent 2542296.