Most of our gemstones are accompanied by gemological reports from leading, internationally recognized gem-testing laboratories. Scans of these reports are available on the respective listing pages for your review. The original certificates are shipped with the gemstone.
If a gemstone is not already certified and you would like to request a gemological report - or if you require additional certification - please Contact Us. We’ll be happy to assist you.
Here is the information about some of the renowned gem testing laboratories we work with:
Gemological Institute of America | GIA
Established in 1931, the Gemological Institute of America (GIA) is a nonprofit organization renowned as the world's foremost authority on diamonds, colored stones, and pearls.
GIA introduced the universally accepted 4Cs (Cut, Color, Clarity, and Carat Weight) grading system, setting the standard for diamond quality evaluation.
With laboratories and educational centers across 13 countries, GIA provides comprehensive gem identification and grading services, ensuring accuracy and integrity in the gem and jewelry industry. Their commitment to research and education continues to advance the science of gemology.
GIA website
Verify a GIA report
GRS GemResearch Swisslab | GRS
Founded in 1996 by Dr. Adolf Peretti in Switzerland, GRS GemResearch Swisslab AG is an independent gemological laboratory specializing in the analysis and certification of high-quality colored gemstones, including rubies, sapphires, emeralds, spinels, tourmalines, and garnets.
GRS is renowned for its expertise in determining gemstone origin and authenticity, as well as for introducing descriptive color terms like "pigeon’s blood" and "royal blue" to classify gemstone hues.
With laboratories strategically located in major gem markets worldwide, GRS combines advanced analytical techniques with extensive field research to provide reliable and detailed gemstone reports.
GRS website
Verify a GRS report
International Gemological Institute | IGI
Established in 1975 in Antwerp, Belgium, the International Gemological Institute (IGI) is one of the world's largest independent gem certification and appraisal organizations.
IGI offers comprehensive services, including the grading and certification of diamonds, colored gemstones, and finished jewelry.
With a global presence encompassing laboratories and educational facilities in key cities such as New York, Hong Kong, Mumbai, and Dubai, IGI is recognized for its commitment to accuracy, consistency, and transparency in gemological assessments.
Their reports are widely accepted in the international jewelry market, providing consumers and professionals with trusted evaluations.
IGI website
Verify an IGI report
Swiss Gemmological Institute | SSEF
Established in 1972, the Swiss Gemmological Institute (SSEF) is a non-profit foundation based in Basel, Switzerland.
Renowned for its scientific approach, SSEF provides independent and precise analyses of colored gemstones, diamonds, and pearls.
Their reports are highly respected in the international gem trade.
SSEF website
Verify an SSEF report
Gübelin Gem Lab | Gübelin
Founded in 1923 in Lucerne, Switzerland, the Gübelin Gem Lab is one of the world's most respected gemological laboratories.
Known for its expertise in colored gemstone analysis, the lab combines state-of-the-art technology with deep gemological knowledge to provide detailed reports on gemstone identity, origin, and treatments.
Gübelin website
Verify a Gübelin report
American Gemological Laboratories | AGL
Established in 1977 and based in New York City, AGL specializes in the analysis of colored gemstones.
Their Prestige Reports provide comprehensive information on gemstone identity, origin, and treatments, and are widely recognized in the gem industry.
AGL website
C. Dunaigre Consulting GmbH | C. Dunaigre
Led by gemologist Cédric Dunaigre, this Switzerland-based laboratory offers detailed analyses of colored gemstones, focusing on identification, treatment detection, and origin determination.
Known for its precision and reliability, the lab serves clients worldwide.
C. Dunaigre website
Verify a C. Dunaigre report
Lotus Gemology | Lotus
Based in Bangkok, Thailand, Lotus Gemology specializes in the testing of colored gemstones, particularly rubies, sapphires, and spinels.
The lab is known for its detailed reports that include information on gemstone identity, treatments, and origin, as well as high-quality photomicrographs.
Lotus website
Verify a Lotus report
Bellerophon Gemlab | Bellerophon
Bellerophon Gemlab offers comprehensive gemstone analysis services, including identification, treatment detection, and origin determination.
Utilizing advanced technology and a commitment to accuracy, the lab provides detailed reports for a variety of colored gemstones.
Bellerophon website
Verify a Bellerophon report
ICA GemLab | ICA
An initiative of the International Colored Gemstone Association, ICA GemLab is based in Bangkok, Thailand.
The lab focuses on the analysis of colored gemstones, providing reports that detail identity, treatments, and origin, adhering to ethical and transparent practices.
ICA website
Verify an ICA report
Guild Gem Laboratories | Guild
Founded in 1980 in Los Angeles, Guild Gem Laboratories offers a range of gemological services, including gemstone identification, grading, and appraisals.
With a global presence, the lab serves clients in various regions, maintaining a reputation for accuracy and professionalism.
Guild website
Verify a Guild report
Asian Institute of Gemological Sciences | AIGS
Established in 1978 in Bangkok, Thailand, AIGS operates both as a gemological laboratory and an educational institute.
The lab provides detailed reports on gemstone identity, treatments, and origin, and is recognized for its contributions to gemological education and research.
AIGS website
Verify an AIGS report
Gemmological Institute of India | GII
Founded in 1971, the Gemmological Institute of India is based in Mumbai and serves as a premier gemological laboratory and educational institute.
GII offers comprehensive services, including gemstone identification, grading, and certification, and is instrumental in advancing gemological studies in India.
GII website
Verify a GII report
