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April 15, 2026

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ABOUT PGT LABS Precious Gem and Diamond Testing, Grading, and Certification

Precious Gem Testing Laboratory (PGTL) was established, diamond and precious gem owners in Sri Lanka and India had limited ability to accurately test, grade, and value their stones. They were faced with outdated equipment, antiquated methods, and a general lack of clarity. PGTL has changed this. At our state-of-the Read More..

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