Welcome to Spectra Gemological Testing Laboratory (SGTL)
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Spectra Gemological Laboratory (SGTL) delivers precise, unbiased, and globally recognized gem testing using advanced technology and expert gemologists. We serve jewelers, traders, manufacturers, and collectors, ensuring transparency, authenticity, and confidence in every diamond, gemstone, and jewelry certification.
Powered by modern gemological instruments and scientific expertise.
Grading and certification aligned with globally recognized protocols.
Certified gemologists with extensive industry experience.
Integrity and impartiality in every report we issue.
State-of-the-art testing equipment for precise and reliable results
Preferred by jewelers, traders, and collectors worldwide.
