OUR HERITAGE
Thirty-Five Years of
Precision
Hand-cut sapphires and rubies from Bangkok — for jewellers, designers, and dealers who measure quality in micrometres, not adjectives.
FAMILY LEGACY
The Lim Gems Factory Story
Chanon Trakulmechokchai · Founder
Lim Gems Factory was established in 1991 in Bangkok's business centre by founder Chanon Trakulmechokchai, who had already spent years in the gemstone and jewellery trade. Working on the jewellery side first, he came to a conclusion that has shaped the company ever since: a stone only earns its value once it is set — and the cut is what decides whether it will look remarkable in the setting or disappear into it.
OUR CRAFT
From Rough Stone to Precision Gem
Rough Selection & Planning
Each rough stone is evaluated for colour saturation, clarity potential, and optimal yield. Our master cutters map the stone before a single facet is cut, planning the orientation to maximise brilliance and minimise inclusions. We work primarily with sapphires and rubies sourced from trusted mining partners in Sri Lanka, Madagascar, Myanmar, and Thailand.
Precision Cutting & Faceting
Using diamond-tipped cutting wheels and proprietary techniques refined over thirty-five years, our cutters shape each stone to exact calibrated dimensions. We achieve tolerances of ±0.1mm — essential for jewellers who need stones that fit standard settings without re-cutting. Each facet is angled to maximise light return according to the stone's refractive index, and the girdle is polished cleanly so the stone seats properly and reads bright from every angle in the setting.
Quality Grading & Calibration
Every finished stone undergoes multi-point inspection: dimensional calibration with digital micrometers, colour grading under standardised D65 illumination, and clarity assessment at 10x magnification. Stones are sorted into precise quality tiers and packaged in calibrated lots ready for immediate setting — saving our clients time and reducing waste.
OUR PROMISE
What we hold ourselves to
The factory was founded on a small set of convictions that haven't moved in thirty-five years. They shape how we cut, how we sort, and how we deal with every customer.
Quality first
Every stone is cut, finished, and inspected to a standard we would accept ourselves. Cutting is our main focus, and our specialised team is what makes that possible.
Trust earned, stone by stone
We deal professionally and truthfully. Treatment, origin, and grade are disclosed honestly on every order — even when it costs us a sale.
Detail in every parcel
Every parcel is sorted carefully and thoroughly — by size, by colour, by clarity. The lots you receive should be ready to set, with no surprises hidden in the middle.
Range to support your work
Beyond our specialty in exceptional-cut ruby and sapphire, we provide a wide range of qualities, shapes, and sizes — including custom cuts to fit your specific designs and mountings.
BANGKOK HERITAGE
Why Bangkok Is the World's Gemstone Capital
Bangkok has been the centre of the global coloured gemstone trade for over a century. The city's Silom and Mahesak districts house one of the densest concentrations of cutting facilities, gem labs, and trading houses anywhere in the world. Rough stones from Sri Lanka, Myanmar, Madagascar, and East Africa converge here for cutting, treatment, and distribution.
WHERE YOU'LL FIND US
At the world's major gem trade shows
We exhibit regularly at international gem and jewellery fairs — including Bangkok Gem & Jewelry Fair and Jewellery & Gem ASEAN — where new and existing clients can review our calibrated parcels in person, meet the team, and discuss specific projects across the table.
COMMON QUESTIONS