METHOD OF CHANGE OF DIAMOND COLOR AT HIGH TEMPERATURE AND HIGH PRESSURE

摘要

FIELD: treatment of natural diamond for change of its color. ^ SUBSTANCE: proposed method includes the following stages: (i)forming of reaction mass at presence of diamond pressure-transmitting medium which fully surrounds it; (ii) action on reaction mass by high temperature and pressure during required period of time; proposed diamond is brown diamond, type IIa; its color is changed from brown to rose by action on reaction mass by temperature from 1900°C to 2300°C at pressure from 6.9 GPa to 8.5 GPa. ^ EFFECT: enhanced efficiency of enriching diamond color keeping its crystals intact. ^ 30 cl, 4 dwg, 1 ex