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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. (2012) A dyed blue opal with play-of-colour, Gems & Gemology, Vol. 48, No.1, pp 69-70

The laboratory received an unusual blue opal for identification. Its unusual colour and striking play-of-colour raised doubt regarding its authenticity. Presence of cellular structure (digit pattern) identified this opal as natural from Wollo, Ethiopia. However, the blue colour was not correct for an opal. With desk model spectroscope three bands at 540, 580 and 650 nm were seen, which are associated with cobalt and is often seen in dyed blue materials. Under Chelsea filter, the opal appeared strong red, confirming the presence of dye. Further microscopic examination revealed a surface break with blue colour concentrations.


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Choudhary G. (2011) Quartz with acicular emerald inclusions, Gems & Gemology, Vol 47, No. 4, pp 323

The laboratory encountered a quartz specimen which displayed eye visible elongated emerald crystals present as inclusions similar to commonly seen rutile or tourmaline. The prominent green inclusions displayed hexagonal profile, consistent with emerald but their acicular / elongated habit raised some doubt. Spectroscopic properties concluded these as emeralds. Textural relationships indicated that the emerald crystals formed before the host quartz i.e. they are protogenetic


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Choudhary G. (2011) Composite malachite plates, Gems & Jewellery, Vol. 20, No. 3, pp 3-5

The author reports on few plates composed of tiny fragments or pieces of malachite. These pieces were held together using a polymer based matrix. Identification of the fragments as malachite was not a problem as they displayed characteristic botryoidal banding with minute radiating crystals. In some areas, the botryoidal banding terminated at uneven boundaries. In between, some randomly oriented minute crystals were visible along with hemispherical pits. The composite nature of these plates was easily identifiable using a 10x loupe and a light source. Presence of gas bubbles along the junction planes within the cementing agent was readily visible all over the plate, although a careful observation was necessary


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Choudhary G. (2011) Pink cat's eye quartz, with color and chatoyancy caused by tourmaline needles, Gems & Gemology, Vol 47, No. 3, pp 245-246

The author describes an unusual occurrence of a quartz cat's whose colour as well as chatoyancy was caused by pink tourmaline needles. Tourmaline is quite often present in quartz giving rise to sagenetic variety, however in this case these tourmaline needles were present in one direction giving rise to chatoyancy. These tourmaline needles displayed their typical triangular cross section, which were further confirmed by infra red spectroscopy.


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