The Wayback Machine - https://web.archive.org/all/20041217091142/http://www.ajediam.com:80/HP-HT_treatment_diamonds.html
HP-HT process of Diamonds
Diamond can be processed by High Temperature (HT) and High Pressure (HP) treatment to improve its appearance. It is a similar natural treatment as 3.3 billion years ago when nature create diamonds.
Only very rare diamonds type 2A are suitable for this color improvement. HP/HT processed diamonds cost less. That gives you the possibility to buy a D color diamond for the price of a F color.
There is not one single difference between Diamonds from type 2 A, who were processed by nature 3.3 billion years ago, and diamonds who are processed artificial HP-HT now. These Diamonds are very rare especially in big sizes.
Pay attention!
HPHT process is created thanks to very expensive high tech processing machines who did not exist a few years ago.
The gemological laboratories which delivered diamond certificates before the year 2001 could not detect these characteristics.
It's a DNA improvement of the diamond that gives the possibility to detect these characteristics.
But nobody can tell if it was natural or artificial. It is the same treatment. So what?
Buying an HP-HT treated diamond has a truth value.
Just pay the correct price for it!
Diamond certificates will mention under "comments":
HP/HT processed to improve its color.
In the girdle of the diamond you will find this engraved!
The DNA of a diamond gives also the possibility to recognize every international certificated diamond, even if it has been
re-cut! Stolen diamonds can be detected by DNA analyze!
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