https://www.ssef.ch/
The science of gemstone testing since 1972 - SSEF
Jun 19, 2026 - A world leader in coloured gemstone, diamond and pearl testing Get your items tested by us. Fast shipping and safe door-to-door delivery On-site testing in...
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Gold Silver Diamond Tester Selector Gemstone Testing Kit Digital Electronic Tool
$16.97
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Diamond Gemstone Tester Selector Illuminated Jewelry Testing Tool Pen Portable
$10.99
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https://www.algtlabs.com/
ALGT — Antwerp Laboratory for Gemstone Testing
Independent gemological laboratory providing comprehensive gemstone analysis and certification. Headquarters in Antwerp, Belgium.
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