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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) Dumortierite- quartz rock presented as sapphire, Gems & Gemology, Vol. 49, No. 1, pp 59-60

The Gem Testing Laboratory of Jaipur, India, received for identification an opaque blue specimen, submitted as sapphire. The 5.16 ct cabochon, measured 12.59 x 10.28 x 4.71 mm. Examined under a fibre-optic light source, the specimen displayed an uneven blue colouration associated with dyed materials possibly dyed quartzite; however, the specimen was identified as a rock mixture of dumortierite and quartz.


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Choudhary G. (2013) Zoned scapolite from India, Gems & Gemology, Vol. 49, No.1, pp58-59

While visiting a local dealer, this contributor encountered parcels of rough and faceted scapolite that appeared strongly zoned to the unaided eye. They were reportedly mined from Karur in the southern Indian state of Tamil Nadu. From the parcels, one rough and one faceted specimen were obtained. The faceted stone was a 9.10 ct oval mixed cut, while the 4.18 g rough specimen was a tetragonal prism with partially broken bipyramidal terminations. Both had a pale yellow color with strong brown zones.


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Choudhary G. (2013) Opal- calcite composite, Gems & Gemology, Vol. 49, No. 1, pp 55-56

Composites assembled from opaque to translucent gem materials such as turquoise, chalcedony, and chrysocolla have become quite popular in the past few years, as evidenced by the number of samples received for identification at the Gem Testing Laboratory in Jaipur, India. We recently examined a white-brown, translucent to opaque oval cabochon that turned out to be a composite featuring an unusual combination of gem materials - opal and calcite


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Choudhary G. (2012) An overview of inclusions in Indian Gemstones. Presented at the GIT Conference 2012 held at Bangkok, Thailand from 12-13 December 2012. Abstract in proceedings volume

Due to the diverse geological setting, India hosts a large number of minerals and gemstones; hence, various types of inclusions have been found. This paper overviews the crucial types of inclusions found in various gemstones mined in different locations of India. Emphasis is given on the types of inclusions rather than the geographical and geological location, although, geographical location of the stone is provided where available along with the inclusions observed. In this paper, inclusions in around 21 different gemstone species have been studied, including apatite, beryl (emerald, aquamarine and other varieties), chrysoberyl (including alexandrite and cat's eye), corundum (ruby and sapphire), diopside (including star and cat's eye), epidote, feldspar (labradorite, moonstone, sunstone), fluorite, fuchsite, garnet (pyrope-almandine, hessonite), iolite, kyanite, quartz (rock crystal, citrine, smoky, rose, sagenitic, cat's eye and chalcedony-carnelian), scapolite, serpentine, sillimanite, sphene, spinel, topaz, vesuvianite and zircon.


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