公开(公告)号：EP1315558B1

公开(公告)日：2006-10-18

申请号：EP01959593.3

申请日：2001-08-08

申请人： Bellataire International LLC

发明人： ANTHONY, Thomas R., General Electric Company ,  BANHOLZER, William F., General Electric Company ,  CASEY, John K., General Electric Company ,  KADIOGLU, Yavuz, General Electric Company ,  SMITH, Alan C., General Electric Company ,  JACKSON, William E., General Electric Company ,  VAGARALI, Suresh S., General Electric Company ,  WEBB, Steven W., General Electric Company

IPC分类号： B01J3/00

CPC分类号： B01J3/062 ,  B01J3/067 ,  B01J2203/062 ,  B01J2203/0655 ,  B01J2203/0695 ,  B24B19/16 ,  B30B11/004 ,  B30B11/007

摘要： The present invention is directed to a method for treating discolored natural diamond, especially Type IIa diamond and Type IaA/B diamond with nitrogen as predominantly B centers, for improving its color. The method includes preblocking and preshaping a discolored natural diamond to prevent its breakage in a high pressure/high temperature (HP/HT) press, placing said discolored natural diamond in a pressure transmitting medium which is consolidated into a pill. Next, the pill is placed into a HP/HT press at elevated pressure and elevated temperature within the graphite-stable or diamond-stable range of the carbon phase diagram for a time sufficient to improve the color of said diamond. Finally, the diamond is recovered from said press. Colorless and fancy colored diamonds can be made by this method.