Ten labs. Thirteen reports. The same conclusion.
Material from this deposit has been examined independently by ten recognised gemological laboratories across four countries. Every single report on file states the same thing: natural corundum, no indication of heating.
Who has examined this material.
Gemological Institute of America — sapphire identification and treatment reporting.
Gemresearch Swisslab AG, Lucerne — gemstone identification and treatment analysis.
American Gemological Laboratories — origin and treatment reporting.
Gem and Jewelry Institute of Thailand — CIBJO-listed identification laboratory.
Bangkok — origin determination specialists for ruby, sapphire, and spinel.
International Colored Stone Association GemLab — origin reports.
Tokyo Gem Laboratory (Thailand) Co., Ltd. — gem identification reporting.
Asian Institute of Gemological Sciences, Bangkok — gemstone identification.
Swiss Gemmological Institute, Basel — independent gemstone testing.
Independent gemstone identification laboratory.
A sample of what the reports say.
A few representative entries, transcribed directly from the lab reports on file.
These entries describe specific, previously examined stones from the deposit — not a guarantee for material not yet submitted. The full packet is available below.
What these reports confirm, consistently.
Standards vary slightly by laboratory, but across all eleven reports on file, four things repeat without exception:
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Natural corundum
Every report identifies the material as natural sapphire — not synthetic, not a simulant.
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No indication of heating
Stated explicitly, in those or equivalent words, on every single report — from GIA to Lotus Gemology.
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Recognised as "golden sheen"
Multiple labs independently name the same trade term for the phenomenon, unprompted.
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Kenyan origin, where tested
Reports that include an origin opinion (AGL, ICA GemLab, Lotus Gemology) all point to Kenya.
The full certification packet.
Eleven reports, eight laboratories, one PDF. This is our reference packet — the report for a specific stone you're inquiring about will be confirmed and shared alongside it.
gold-sheen-sapphire-certification-packet.pdf
GIA · GRS · AGL · GIT · Lotus Gemology · ICA GemLab · TGL · AIGS · SSEF · IGL — 12 pages
Ask to see a report before you commit.
We're glad to send the certificate for any specific stone alongside photography.
Request a certificate