OBTAINED BY CHEMICAL DEPOSITION FROM VAPOR PHASE MONOCRYSTALLINE SYNTHETIC DIAMOND MATERIALS, WHICH HAVE UNIFORM COLOUR Russian patent published in 2016 - IPC C30B25/02 C30B25/16 C30B29/04 C23C16/27 A44C17/00 C30B33/02 C23C16/56 

FIELD: technological processes.

SUBSTANCE: invention relates to production of coloured diamonds, which can be used in optics and for jewelry purposes. Monocrystalline CVD-synthetic diamond material comprises multiple layers, which includes at least two groups of layers differ in their defects composition and colour, wherein type of defects, concentration of defects and thickness of layers for each of said at least two layers are such that if coloured monocrystalline CVD diamond material is processed into diamond with round brilliant cut, containing platform and culet and having depth from platform to culet of more than 1 mm, then diamond with round brilliant cut has uniform colour when viewed with naked eye of person in standard surrounding observation conditions in, at least, direction through platform to culet; said, at least, two groups of layers contain first group of layers containing alloying admixture of boron in concentration sufficient for producing blue colour, and second group of layers containing lower concentration of alloying admixture of boron, first group of layers contains not compensated dopant of boron in concentration of not less than 0.01 ppm and not more than 5.00 ppm, and second group of layers contains dopant of insulating replacement nitrogen in concentration of not less than 0.01 ppm and not more than 5 ppm, wherein visibility quality indicator (FM) of individual layers is not more than 0.15 and is calculated as product of: FM = thickness (mm) of layers for first set of layers × thickness (mm) layers for second set of layers × concentration (ppm) of solid-state boron in first group of layers × depth (mm) of round brilliant cut.

EFFECT: invention enables to obtain uniform blue colour diamonds with high growth rate.

14 cl, 6 dwg