Identifying and Pricing HTHP-Treated Diamonds
http://www.gemguide.com/news/AGTAMar09HTTP.htm
Natural diamonds may be treated to improve their colorless appearance or to produce a variety of colors. The most common method used today is the High Temperature, High Pressure method, or HTHP. Other methods include irradiation, annealing, and combinations of treatment methods. Because of this, the identification of treated diamonds poses the greatest challenge to the gem labs today.
- Richard B. Drucker
Useful links:
www.gemguide.com
www.agta.org
Great review.
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