Report Verification



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


Sapphires heated with high temperatures and low pressures (~1kbar) first entered the market in 2009, becoming more common since 2016. This article examines the process in detail and looks at the question of whether a separate disclosure is needed for the treatment.


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Choudhary G. (2015) Coral Inclusions in Plastic. Gems & Gemology, Vol. 51, No. 3, pp 341-342

Coral-plastic composites or orange-red plastics have been known as coral imitations for decades. This specimen turned out to be notable as the orange-red plastic specimen contained few spots of lighter colour, which were identified as carbonate-type white coral.

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Choudhary G. (2015) A Shattuckite Briolette. The Journal of Gemmology, Vol. 34, No. 7, pp 566-567

A deep intense blue briolette of shattuckite was examined, which also had few areas of malachite.  The specimen was identified as shattuckite on the basis of Raman spectroscopy, and without this technique it could have been mistaken for azurite.

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Choudhary G. (2015) Fracture-filled Synthetic Emerald, with Quartz Inclusions. The Journal of Gemmology, Vol. 34, No. 6, pp 483-484

A synthetic emerald was seen, which was unusual for two aspects - one, the fractures were filled with a resin, and two, it contained some crystalline inclusions, which were identified as quartz. These quartz crystals were present as 'head' of the spicules, and as well as isolated clusters. Confirmation of synthetic nature of emerald was made through other inclusions along with infra-red spectra, while that of quartz by Raman spectroscopy. This was the first time that the inclusions of quartz were reported in an emerald of synthetic origin.

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