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Being based in a gem centre like Jaipur, GTL is exposed to a range of unusual and bizarre gem materials submitted for identification. Because of the dedication and passion our staff gemmologists possess, these gem materials undergo a thorough research for their complete understanding. The results of such research are shared with the world through publications in various highly read gemmological journals of international repute.

In The Press


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Choudhary G. (2013) Turquoise- rock crystal composite. Gems & Gemology, Vol. 49, No. 2, pp 123-124

Recently examined was a faceted rock crystal backed by a slice of turquoise - an obvious but unusual combination of gem materials. The sample was easily identified as composite due to its colour and appearance. From the top, it appeared light greenish blue, from the sides, it exhibited a colourless top and bluish green slice at base.


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Choudhary G. (2013) Orangy pink coated "soft coral". Gems & Gemology, Vol. 49, No. 2, pp 121

Dyeing white coral to imitate popular colours such as red, orange and pink is a widely known practice. But, a bead starnd examined at the Gem Testing Laboratory in Jaipur India, revealed a colouring method unfamiliar to gemmologists.


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Choudhary G. (2013) 'Dyed' and 'Smoke' treated opals. Midland Focus, 23rd issue

In the recent times, we at the Gem Testing Laboratory, Jaipur have received numerous opals for identification with unusual body colours such as blue, purple, pink, etc. displaying bright spectral colours on the surface, 'play of colour'. Further, few black opals have also been encountered, which is the most sought after and rarest of the opal varieties. This is because of the fact that dark body colour enhances the 'play of colour' effect, dramatically. While, the best qualities of natural black opal originate from Australia, little quantity is also reported from Honduras; some dark brown material is reported from Indonesia and even Ethiopia. The fancy colours mentioned above were proved to be 'dyed' while the black ones, 'smoke-treated'.


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Choudhary G. (2013) Bottled Up: An interesting incident with an RI contact fluid bottle, Gems & Jewellery, Vol. 22, No.2, pp 12-13

Recently, during an on-site testing assignment, the author was taken by surprise when he was setting up the equipment. While opening a fresh bottle of RI Contact Fluid, a solid object was seen attached to the brush end of the fluid applicator. Initially it was thought to be impurities deposited on the brush. Therefore, the applicator was taken out very gently so that the attached material could be removed without contaminating the fluid. The author was surprised when the attached solid material was revealed as a cluster of large, bright yellow, bi-pyramidal crystals. These were immediately assumed to be sulphur.


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