METHOD FOR MAKING FANCIFULLY COLOURED ORANGE MONOCRYSTALLINE CVD-DIAMOND, AND FINISHED PRODUCT Russian patent published in 2013 - IPC C30B33/04 C30B33/02 C30B29/04 A44C17/00 

FIELD: metallurgy.

SUBSTANCE: monocrystalline diamond material that has been grown using a CVD method and has concentration of single substituent nitrogen [N_s 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 [V_T] in the obtained diamond material is at least more than (a) 0.5 ppm and (b) by 50% more than concentration [N_s 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.

EFFECT: diamonds obtain fancifully orange colour during such treatment.

16 cl, 3 dwg, 4 tbl