About
- Company Profile
- Dr. A. Peretti
News
GRS Reports
Research
- Analytical Methods
- Inclusion Gallery
Publications
Shop
Report Verification
Contact

₀
Cart

01/03/1997

Corundum – where and why?

Share

Email
Twitter
Facebook
Google +
Pinterest
Tumblr
Linkedin
Vkontakte

Authors: Adolf Peretti
Published in: Momentum (Mouawad)

Download Publication

10/09/2015

Latest GRS Alerts

Warning: Synthetic Padparadscha sold as Natural in the trade. 11/09/2018

GRS Alert: Unusual phosphorescent pebbles identified as synthetic aggregates 24/04/2016

GRS Alert: A new type of synthetic spinel appears at the Bangkok show 14/09/2015

Recent Posts

AGTA announces guideline of full disclosure for pressure and heat-treated sapphires 10/12/2018

Identification and characteristics of PHT (‘HPHT’) – treated sapphires – An update of the GRS research progress (update 12 November 2018) 03/11/2018

Spinel formation by sulphur-rich saline brines from Mansin (Mogok area, Myanmar) 02/10/2018

GRS Newsletter

Leave this field empty if you're human:

GRS Gemresearch Swisslab

5 days ago

Dear customers,

GRS has recently posted some updated research on sapphires that have undergone Pressure High Temperature (“PHT”) treatment (see GRS website). GRS had disclosed this type of treatment since mid 2015 to a total of 73 different customers and issued hundreds of reports.

Earlier this year in our New York lab, we discovered that these PHT treated sapphires were traded in the market without proper disclosure, and the reports issued by other laboratories on these sapphires did not detect this type of treatment. This raised some questions within the New York gemstone community resulting in stones being returned back to the supplier and ultimately to the producer (the treatment is done in Korea and can be marketed from anywhere in the world).

In response, the producer approached GRS and demanded that the treatment be classified as “H - conventional heat” only in our reports. As a promise to the producer and re-confirmation of our policy, GRS updated our research on an additional 140 samples and re-confirmed our previous decision from 2015 to separate the disclosure of PHT treatment from conventional heat treated sapphires.

GRS customers can be assured that GRS maintains our stance on the disclosure of this treatment since mid 2015 (formerly as “HPHT” and now as “PHT”). No re-checks are required.

GRS does not support LMHC’s (CGL, CISGEM, DSEF, GIA, GIT, Guebelin Gem Lab and SSEF) recent decision to take on a policy of non-disclosure on this subject.

Nevertheless, we are very pleased that our research was very well received by a wide range of trade members and organizations, and that our initiative to enhance disclosure of this new type of treatment has contributed to a more transparent market.

Yours sincerely,
Dr. A. Peretti

Director GRS ... See MoreSee Less

View on GRS Facebook Page

View on GRS Facebook Page

Contact Us
GRS on Twitter
GRS On Facebook
GRS On Google+
GRS On Pinterest
GRS On Instagram
GRS On YouTube

© 2017 GRS GemResearch Swisslab AG | www.gemresearch.ch

Disclaimer
Company Profile
News
Gemstone Reports
Contact
Privacy Policy
GRS Report Verification

We use cookies to ensure that we give you the best experience on our website. If you continue to use this site we will assume that you agree with it.Ok Privacy policy