Separation of Natural and Artificially Colored Diamonds
Got diamonds? No problem. The AGTA Gemological Testing Center can identify the nature of the apparent color, or lack of color, in a diamond. UV/visible low temperature spectroscopy is used to analyze colored diamonds and to determine if the color is natural or due to artificial irradiation. The AGTA GTC's Raman micro-spectroscopy unit is employed to examine colorless diamonds that are suspected of being decolored by High Pressure High Temperature (HPHT) treatment.

Diamond ID Report
Sample AGTA GTC Colored Diamond Identification Report. Click on the report for a larger image.

Diamond Jewelry Report

Sample AGTA GTC Colored Diamond Identification Report. Click on the report for a larger image.

A full listing of the AGTA Enhancement Disclosure Requirements can be found here:

Other Reports
The AGTA Gemological Testing Center offers a full range of gemological services, including the following listed below:

    For our current fee schedule, see the following links:


American Gem Trade Assocation Gemological Testing Center
18 East 48th St., Suite 502
New York, NY 10017, USA
Tel: 212-752-1717; Fax: 212-750-0930
E-Mail: info@agta-gtc.org; Web: www.agta-gtc.org
© 1999–2005 American Gem Trade Assocation Gemological Testing Center. All rights reserved. Users may download this information for their own private, non-commercial use. Any other reproduction of this document (text or graphics) without the express written consent of the AGTA GTC is strictly prohibited.
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