Est. 2006 · Bangkok · Dubai
From the world's oldest gem markets to your collection
Since 2006, K&H Gems DMCC has operated at the heart of the global coloured-stone trade. We source directly from cutters and treaters in Bangkok's Jewelry Trade Center, certify every investment-grade stone with independent laboratories, and ship under fully-insured parcel with transparent customs declarations. No middlemen. No re-heat stories. No under-declared invoices.
Our story
Eighteen years of direct sourcing
Our founders spent their early careers on the cutting floors of Chanthaburi and the trading desks of Bangkok's Silom. When K&H Gems DMCC was incorporated in 2006, the ambition was narrow and clear: make origin-verified coloured stones — the kind only insiders could previously buy — available to private clients worldwide on reasonable terms.
That founding principle still drives us. Every ruby, sapphire, emerald, tourmaline, and rarer stone in our catalog is hand-picked by our gemologists, who fly out to Bangkok's gem markets weekly. We send the most important stones to GRS, SSEF, Gübelin, GIA and AGL for independent reports before listing. If a stone doesn't clear gemological due-diligence, it doesn't make the catalog.
Today we operate two offices: Bangkok for sourcing and gemological work, Dubai for international trading and private client relationships. Our clients are collectors, bespoke-jewelry designers, family offices, and a growing network of authorized dealers in 14 countries.
What we stand for
Four principles, non-negotiable
Direct source only
No resellers between our gem desk and you. We know every treater, every cutter, and exactly what the stone looked like before processing. Origin stories are verifiable or we don't tell them.
Independent certification
Every stone ≥$3,000 ships with a third-party report — GRS, SSEF, Gübelin, GIA, AGL, or IGI for diamonds. We never issue our own certificates.
Full declared value
Every parcel is shipped fully insured with accurate customs documentation. We decline requests to under-declare, period. Your buyer protection depends on it.
Transparent pricing
Our pricing methodology is published, our wholesale-to-retail margin is in the FAQ, and dealer pricing is formula-based — not relationship-based.
Headquarters
Bangkok — the sourcing floor
Our Bangkok office sits inside the Jewelry Trade Center (JTC) on Si Lom — the purpose-built tower that houses Thailand's coloured-stone trade. Every weekday our gemologists walk the JTC floors and the adjacent gem streets of Silom Soi 13, hand-selecting stock from the same cutters who supply Geneva and Hong Kong dealers.
- Address
- Jewelry Trade Center, Si Lom, Bangrak, Bangkok 10500, Thailand
- Hours
- Mon–Sat · 10:00–18:00 ICT · Sun 12:00–17:00
- Viewings
- By appointment · walk-ins welcome during business hours
International office
Dubai — the trading desk
Almas Tower houses the DMCC (Dubai Multi Commodities Centre) Free Zone — one of the world's three major gem and precious-metal trading hubs. From here we coordinate international client relationships, dealer partnerships, and the high-value private viewings for clients who prefer the Middle East over Asia.
- Address
- Almas Tower, DMCC Free Zone, Jumeirah Lakes Towers, Dubai, UAE
- Hours
- Sun–Thu · 09:00–18:00 GST
- Viewings
- By appointment only — please book at least 24 hours in advance
The people
Gemologists, not salespeople
Everyone on our desk is either a credentialed gemologist (GIA GG, AGS AJP, FGA) or has spent years trading on Bangkok's gem streets. We don't sell what we can't grade ourselves.
Founder & Principal Gemologist
Gem Desk, Bangkok
GIA Graduate Gemologist. 18+ years sourcing coloured stones across Southeast Asia with a focus on origin-determining inclusions for ruby, sapphire, and emerald.
Head of Trading, Dubai
Dubai Desk
Manages international dealer relationships and high-value private-client mandates. Previously on the trading floor of a DMCC-licensed wholesaler.
Head of Quality
Lab Relations
Coordinates all third-party certification. Personally handles submissions to GRS, SSEF, Gübelin, GIA and AGL. Reviews every return for gemological integrity.
Memberships
We're members and signatories of
- DMCC Free Zone — licensed member, Almas Tower (Dubai)
- Kimberley Process — conflict-free diamond sourcing
- CIBJO Blue Book protocols — disclosure of treatments
- Responsible Jewellery Council (applicant) — ethical sourcing audit
Membership proof and licence numbers are available on request — please write to compliance@topgems.com.
Start a conversation
Whether you're hunting a specific stone, commissioning a bespoke piece, or building a long-horizon collection — we respond within one business day, no obligations.