PRODUCTION OF DIAMONDS UNDER ACTION OF THE HIGH PRESSURE AND TEMPERATURE Russian patent published in 2006 - IPC B01J3/00 C01B31/06 C30B29/04 

FIELD: production of the jewelry quality diamonds from the natural low-grade undecoratively colored diamonds.

SUBSTANCE: the invention is pertaining to production of the diamonds of the jewelry quality from the natural low grade undecoratively colored so-called "brown" diamonds, especially from the diamonds of IIa type and IaA/B type, in which nitrogen forms predominantly B-center for improvement of heir color. The invention provides for realization of the rough faceting and molding of the undecoratively colored natural diamond for giving it the streamline form to avoid its breakup in the press of the high-pressure and heating (HP/HT press). The indicated undecoratively colored natural diamond is put in the pressure transferring medium, which then is compacted into the tablet. Then the tablet is put in the HP/HT squeezer under the high pressure and temperature kept in the field of stability of the blacklead or the field of stability of the diamond of the phase diagram of carbon for the time duration sufficient for improvement of the color of the diamond. After the operation is terminated extract the diamond from the squeezer. The method ensures production of the colorless and decoratively colored diamonds.

EFFECT: the invention ensures production of the colorless and decoratively colored diamonds.

25 cl, 6 ex, 2 dwg