Welcome TGTL

Our Lab —Tej Gem Testing Lab (TGTL)are loved by customers all over the world. But we never take that for granted; we know that every day we have to earn their trust by Service

– Adithya R,Founder of  TGTL

Advanced diamond & colored stone grading laboratory

Enjoy peace of mind as you appreciate the beauty of your diamonds & colored stone with an TGTL grading report. Our innovative and comprehensive analysis will ensure you know exactly what you paid for – as they say, the devil is in the details.


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Latest news

Tanzanite:Tanzanian miner becomes overnight millionaire

A Tanzanian small-scale miner, who became an overnight millionaire in June for selling two rough Tanzanite stones valued at $3.4m (£2.6m), has sold another gem for $2m.

The third discovery by Saniniu Laizer weighed 6.3kg (14lb).Tanzanite is only found in northern Tanzania and is used to make ornaments.It is one of the rarest gemstones on Earth, and one local geologist estimates its supply may be entirely depleted within the next 20 years.The precious stone’s appeal lies in its variety of hues, including green, red, purple and blue.Its value is determined by rarity – the finer the colour or clarity, the higher the price.