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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.

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Choudhary G. (2015) Peridot-Polymer Composite. The Journal of Gemmology, Vol. 34, No. 5, pp 25-26

Recently, a translucent yellowish green, round faceted bead was examined that turned out to be a composite, where tumbled pieces of peridot were held together in a colourless to light yellow transparent polymer matrix. Identification of peridot was done using absorption spectrum, doubling of inclusions and Raman spectroscopy.


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Choudhary G. (2015) Attractive Composite Quartz Beads. Gems & Gemology, Vol. 51, No. 1, pp 106-107

Attractive blue and golden brown spherical beads in this 145.70 ct string were readily identified as artificial by their appearance. They consisted of metallic golden brown veining and concentrations of blue colour against a whiter body. The body of these beads was identified as quartz, while brown veins were composed of copper and zinc.


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Choudhary G. (2015) A Remarkably Large Amblygonite-Montebrasite Carving. Gems & Gemology, Vol. 51, No.1, pp 98-99

Report on an unusually large yellow coloured carving weighing 1,871 grams, which was identified as belonging to the amblygonite-montebrasite series. This gem species is not seen frequently and is known by only few members of the trade. This report outlines the properties of the carving, while Raman spectroscopy proved to be the most important tool in correct identification of this material.


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Choudhary G. (2014) Emeralds from Jharkhand. Presented at the GIT 2014 conference held at Chiang Mai, Thailand from 8-9 December 2014. Abstract in proceedings volume

A relatively new find of emeralds in the East Singhbhum district of the state of Jharkhand has produced a lot of interest in the local market and at very good prices. As per preliminary observations, these emeralds appear to be of decent colour and transparency, although in relatively smaller sizes, less than 5ct. the author outlines the gemmological properties along with microscopic features of these emeralds


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