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Australia's Oldest Internet Diamond Merchant

Gem Studies Laboratory (GSL)

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Headed by Bill Sechos and based in Sydney, GSL was started over twenty years ago to meet the demand in Australia for a first-rate diamond laboratory.

Bill Sechos

From GSL's website:

With over twenty five years experience, Bill holds a science degree from the University of Sydney and received the Australian Prize for his achievements whilst completing the GAA Diploma of Gemmology. He has served as the GAA president and is actively involved with their training programmes as senior lecturer and chairman of the GAA Board of Studies and Examinations.


GSL offer the following services:

  • Diamond Certification

  • Diamond Fingerprinting

  • Pearl X-ray Testing

  • Gemstone Authentication

  • Gem & Jewellery Photography

  • GSL's Australian Opal and Gemstone Photographic Library

GAA Endorsement

In 2003, GSL was officially endorsed by the GAA, Australia's premier gemmological body.

External Links

GSL's WebsiteExternal Link