The Global Benchmark forTrust & Precision
Independent certification, grading, and valuation of natural diamonds, lab-grown diamonds, gemstones, and fine jewelry by internationally trained gemologists.
World-Class Certification Services
Every certificate is backed by cutting-edge instruments and expert gemologists committed to scientific accuracy.
Natural Diamonds
Precise 4Cs grading — Cut, Color, Clarity, Carat — assessed using calibrated instruments and trained gemologists.
Learn More →Lab-Grown Diamonds
HPHT and CVD growth method identification with advanced spectroscopic technology for complete market transparency.
Learn More →Gemology
Detection of treatments, origin confirmation, and species identification for all precious and semi-precious stones.
Learn More →Jewelry Valuation
Comprehensive insurance and resale valuations delivered with transparent methodology and full documentation.
Learn More →Why the World Trusts Us
Jewelers, insurers, and consumers across 95+ countries rely on UGL certificates as the gold standard.
Commercial Independence
Zero affiliation with any retailer, mine, or manufacturer. Our assessments are governed by science alone.
Instrument-Verified
UV-Vis-NIR spectroscopy, FTIR, and precision microscopy verify every single assessment.
Global Acceptance
Certificates recognised by jewelers, auction houses, banks, and insurance companies worldwide.
Tamper-Proof
Cryptographic integrity checks prevent forgery. Our reports cannot be faked or forged.