Discover the authentic story behind every stone
Expert gemological identification, valuation, and certification — delivered with the precision and care that collectors, jewelers, and institutions have trusted for over five decades.
Comprehensive gemological services
From routine identification to complex origin analysis, our laboratory provides the scientific rigor and artistic sensitivity that fine gemstones deserve.
Gem Identification
Accurate determination of a stone's mineralogical identity using advanced spectroscopic and microscopic analysis techniques.
Valuation & Appraisal
Professional fair-market valuations for insurance, estate planning, resale, and acquisition — grounded in current market intelligence.
Certification Reports
Detailed, internationally recognized gemological reports documenting every characteristic of your stone with photographic evidence.
Origin Determination
Geographic origin analysis for rubies, sapphires, emeralds, and other colored stones using trace-element and inclusion profiling.
Treatment Detection
Sensitive identification of natural and treated stones — including heat, fracture filling, diffusion, and irradiation — with documented findings.
Advisory & Consulting
Strategic guidance for collectors, museums, auction houses, and legal professionals on gemstone acquisition, authentication, and portfolio management.
A tradition of scientific integrity
Since 1967, Gubelin Gem Lab has stood at the forefront of gemological science. What began as a small Swiss laboratory has grown into one of the most respected gemological institutions in the world — with a permanent presence in the heart of New York City.
Our team combines decades of hands-on expertise with cutting-edge analytical technology. Every gemstone that enters our laboratory is examined with the same meticulous attention to detail, whether it is a modest quartz or a museum-quality Burmese ruby.
We believe that transparency and impartiality are the foundations of trust in the gem trade. Our reports are unequivocal, our methodologies are peer-reviewed, and our reputations have been earned stone by stone, client by client.
Expertise across every precious stone
From the volcanic depths of Myanmar to the alluvial plains of Sri Lanka — we bring global sourcing knowledge to every analysis.
Rubies
Burmese, Thai, Mozambican — origin and treatment analysis.
Sapphires
Kashmir, Ceylon, Madagascar — geographic provenance determination.
Emeralds
Colombian, Zambian, Brazilian — clarity enhancement evaluation.
Diamonds
Natural vs. lab-grown, origin tracing, and luxury certification.
From submission to certification
A streamlined, transparent process designed around your timeline and needs.
Reach Out
Contact us by phone or email to discuss your gemstone(s) and the services you require.
Submit Your Stones
Deliver in person to our 5th Avenue office or ship via insured courier with full documentation.
Expert Analysis
Our gemologists apply advanced instrumentation and classical techniques to examine every facet of your stone.
Receive Your Report
Collect your detailed certification report and original stones in person, or receive them via secure delivery.
Let's discuss your gemstone
Whether you have a single stone to identify or an entire collection to appraise, our team is ready to assist. Reach out and we'll respond within one business day.
New York, NY 10020-0011
Saturday – Sunday: By appointment only
