Single gem

From the most common to the most curious, our expert gemmologists will analyse any gemstone and biogenic material. Not only will we identify the material but also the treatment and geographical origin, whenever possible.

Small calibrated / melee gems

The certification of coloured melee size gems from 0.4 to 3.7 mm will mention authenticity as well as treatment and origin, whenever possible.

Gem Jewellery

Any piece of jewellery or object set with gemstones or biogenic material can be identified and certified at GGTL Laboratories. Our reports will mention the treatment and geographical determination, whenever possible.

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