Gemological Institute of America — Bangkok
Sathorn / Silom. World-class diamond grading, coloured stone identification and origin analysis.
Exceptional gemstones · Sourced worldwide
Rare stones.
Remarkable origins.
A private selection of exceptional cut and rough gemstones sourced from trusted partners around the world for discerning jewellers, designers and collectors.
Kashmir · Sri Lanka · Swat · Colombia · Panjshir · Chitral · Tanzania · Thailand · Brazil · Global collection ·
The collection
The gemstone collection
Each stone is selected for character, colour and provenance. Our availability follows the mining season, with exceptional single stones offered privately before entering the wider collection.
In the hand
Selected for beauty, character and lasting value.
Our collection brings together carefully selected cut and rough gemstones from established sources around the world. Every stone is reviewed for colour, clarity, character and suitability before it is offered.
Look at the stonesSix countries, one family
Mansehra to the world, stone by stone
A worldwide network of trusted suppliers, cutters and gem professionals, coordinated from our office in Mansehra.
Origins
Five valleys, one road out
Our collection is international, bringing together fine gemstones from celebrated producing regions across Asia, Africa and South America.
From Kashmir and Sri Lanka to Colombia, Panjshir, Chitral and beyond, we source through trusted relationships. Stones are selected, reviewed and prepared through our Mansehra office before being offered.
- Kashmir — sapphire, ruby, aquamarine, garnet and spessartine garnet.
- Emerald sources — Swat, Colombia, Panjshir and Chitral.
- Sri Lanka — a renowned source of fine sapphire.
- Worldwide — cut and rough gemstones sourced without limitation to one region.
- Mansehra — selection, client service and worldwide dispatch.
How a stone reaches you
Four stages, in order
STAGE 01
Buying
We source cut and rough gemstones from trusted suppliers and established trade partners around the world.
STAGE 02
Sorting
Material is reviewed, weighed and sorted by quality, size and intended use through our Mansehra office.
STAGE 03
Cutting
Cut in our own workshops by our own cutters — no outside lapidaries. Native cuts or calibrated sizes, to your spec.
STAGE 04
Export
Parcels are photographed, invoiced and shipped insured, with certification from the Bangkok laboratories arranged on request.
Independent verification
Tested in Bangkok, not by us
We cut our own stones, but we do not grade our own stones. Certification is done by the major laboratories in Bangkok, and the report travels with the parcel.
Asian Institute of Gemological Science
One of Thailand's oldest and most respected institutions for coloured stone identification and education.
The Gem and Jewelry Institute of Thailand
The public testing body, in the ITF Tower on Silom Road.
GemResearch Swisslab AG
Independent international laboratory specialising in treatment detection and origin determination.
Certification is arranged on request and quoted per stone. Turnaround depends on the laboratory and the report requested.
Enquire
Tell us what you're looking for
Send the species, size range and quantity you need. If we don't hold it, we will usually know who does before the week is out.
- Every parcel ships with weights, dimensions and declared origin information where available.
- Video and daylight photographs before payment, always.
- Independent lab certification arranged on request.
- Insured courier worldwide, export documents handled here.
