High pressure/high temperature production of colored diamonds

High pressure/high temperature production of colored diamonds

The present invention is directed to a method for treating discoloured natural diamond, especially Type IIa diamond and Type IaA/B diamond with nitrogen as predominantly B centres, for improving its color. The method includes preblocking and preshaping a discoloured natural diamond to prevent its br...

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Hauptverfasser: KADIOGLU, YAVUZ, ANTHONY, THOMAS RICHARD, SMITH, ALAN C, WEBB, STEVEN W, VAGARALI, SURESH S, CASEY, JOHN K, BANHOLZER, WILLIAM F, JACKSON, WILLIAM E
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Sprache:eng ; fre ; ger
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CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
THEIR RELEVANT APPARATUS
TRANSPORTING
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creator KADIOGLU, YAVUZ
ANTHONY, THOMAS RICHARD
SMITH, ALAN C
WEBB, STEVEN W
VAGARALI, SURESH S
CASEY, JOHN K
BANHOLZER, WILLIAM F
JACKSON, WILLIAM E
description The present invention is directed to a method for treating discoloured natural diamond, especially Type IIa diamond and Type IaA/B diamond with nitrogen as predominantly B centres, for improving its color. The method includes preblocking and preshaping a discoloured natural diamond to prevent its breakage in a high pressure/high temperature (HP/HT) press, placing said discoloured 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.
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subjects CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
THEIR RELEVANT APPARATUS
TRANSPORTING
title High pressure/high temperature production of colored diamonds
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