Archive for August, 2010

GIA Reports Heat Treated Spinels

August 29th, 2010 No comments

Barbra over at Gemologyonline made a post recently that reminded me a an important article that I forgot to post about, so here it is, better late then never!

This spring, the New York laboratory examined a 17.02 ct reddish orange spinel that contained a few small expansion halos or “blebs” emanating from strings of minute inclusions. The appearance of the inclusions suggested the stone was of natural origin — but may have been heat treated.

Read entire GIA Article HERE.

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New Simulants On the Market. Same Old Material, New Colors!

August 20th, 2010 No comments

Well, as many know there is lots of work being done with “jeweler’s” silicas, aka man-made glass for jewelery usage, and they are now matching colors with Refractive Index to simulate certain natural stones, and with RI’s ranging in the 1.54-2.1 range, they can simulate almost any gemstone out there!

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