发明授权
- 专利标题: High pressure/high temperature production of colorless and fancy-colored diamonds
- 专利标题(中): 高压/高温生产无色和花式钻石
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申请号: US10338136申请日: 2003-01-08
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公开(公告)号: US06692714B2公开(公告)日: 2004-02-17
- 发明人: Suresh Shankarappa Vagarali , Steven William Webb , William Edwin Jackson , William Frank Banholzer , Thomas Richard Anthony , George Rene Kaplan
- 申请人: Suresh Shankarappa Vagarali , Steven William Webb , William Edwin Jackson , William Frank Banholzer , Thomas Richard Anthony , George Rene Kaplan
- 主分类号: C01B3106
- IPC分类号: C01B3106
摘要:
The present invention is directed to a method for changing the color of colored natural diamonds. The method includes placing a discolored natural diamond in a pressure-transmitting medium which is consolidated into a pill. Next, the pill is placed into a high pressure/high temperature (HP/HT) press at elevated pressure and elevated temperature for a time sufficient to improve the color of the diamond. The diamond may be exposed at elevated-pressure and elevated-temperature conditions within the graphite-stable region of the carbon-phase diagram—without significant graphitization of the diamond, or above the diamond-graphite equilibrium and within the diamond-stable region of the carbon-phase diagram. Finally, the diamond is recovered from said press. Colorless Type Ia and Type II diamonds may be made by this method.