Colored Gemstone Reports
The AGTA Gemological Testing Center offers a full range of gemological services dealing with colored stones, including the following:


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

Sapphire Necklace Report
Sample AGTA GTC Sapphire Identification Report. Click on the report for a larger image.

Separation of Natural and Enhanced/Treated Gems
A special enhancement section appears on AGTA Gemological Testing Center reports to assure that all gemstone treatments or enhancements are properly identified. This reporting method is consistent with AGTA's enhancement information policies. For both rubies and emeralds, the AGTA GTC quantifies the amount of either residue from the heat process or clarity enhancing substances, if present, as a normal identification service. It will also, upon request, identify the type of clarity enhancing substance present in emeralds.
    A full listing of the AGTA Enhancement Disclosure Requirements can be found here:

Separation of Natural and Synthetic Gems
Sophisticated synthetic stones require intricate methods to identify them. The AGTA Gemological Testing Center employs the latest technology to ensure the reporting of accurate results.

Batch Testing
The AGTA Gemological Testing Center is among the few gemstone laboratories that offer separation of natural and synthetic amethysts. In many cases, the testing is more expensive than the value of the amethysts themselves. Thus we also offer batch testing, both for amethysts and other types of gems. This service is most often used by AGTA members to audit the supply chain through random testing of shipments from mines and cutting factories.

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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