SGL Diamond Certification.
High-Volume Retail & Studded Jewelry Grading.

Founded in 2007 with headquarters in London and major grading hubs across India (including Surat and Mumbai) and Dubai, Solitaire Gemological Laboratories (SGL) is a leading authority in high-speed diamond melee screening, mobile laboratory testing, and studded fine jewelry certification.

SGL Services All Certification Labs

High-Speed Melee Screening Studded Jewelry Certification Micro-Laser Inscribed Girdle

SGL Grading Authority

LONDON • SURAT • DUBAI

Est. 2007

✦ High-Velocity Laboratory Solutions ✦

Why Jewellers & Retailers Partner with SGL

SGL excels in solving the practical, everyday verification challenges of retail jewellers and high-volume diamond manufacturers:

100% Melee Screening

Using high-speed automated photoluminescence spectrometers, SGL tests thousands of calibrated small diamonds (melee lots) per hour to verify synthetic vs natural origin.

Finished Jewelry Reports

Unlike labs that primarily test loose stones, SGL specializes in comprehensive grading cards for fully mounted rings, necklaces, tennis bracelets, and earrings.

Mobile On-Site Testing

SGL deploys mobile laboratory teams directly to manufacturing studios and retail exhibitions, allowing live diamond testing without transit security risks.

Save Up To 70%

Fancy Color Labs

Save Up To 75%

100% Inscribed

New Origin Diamonds

Diamond Cuts

Diamond Colors

By Carats

Diamond Certification

SGL Diamond Certification. High-Volume Retail & Studded Jewelry Grading.