Gem Studies Laboratory (GSL)
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.
From GSL's website:
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
In 2003, GSL was officially endorsed by the GAA, Australia's premier gemmological body.