Spinel / สปิเนล
Red spinel from Burma, hot pink Mahenge and the rare cobalt blue. Most spinel is sold untreated, which is a big part of why collectors chase it.
- Red Burma
- Mahenge pink
- Cobalt blue
Natural gemstones in Bangkok
Spinel, garnet, zircon, star sapphire and more, chosen stone by stone at the Jewelry Trade Center on Silom Road. Every stone on these pages is natural and earth-mined. We tell you exactly how it has been treated before you pay, and any stone can go to GIT or AIGS for an independent lab report.
พลอยแท้จากธรรมชาติ คัดทีละเม็ดที่ JTC สีลม ทั้งสปิเนล โกเมน เพทาย ไพลินสาแหรก และไพฑูรย์ แจ้งการปรับปรุงคุณภาพชัดเจนก่อนซื้อ พร้อมส่งตรวจใบรับรองจาก GIT หรือ AIGS ได้ทุกเม็ด
The stones
Each page covers colours, origins, treatments and price per carat, with stones you can see in person at JTC.
Garnet / โกเมน
Raspberry rhodolite, green tsavorite and orange spessartite. Garnet gives you more colour per baht than almost any other stone, and it is one of the nine nopphakao gems.
- Rhodolite
- Tsavorite
- Spessartite
- Mozambique
Zircon / เพทาย
Natural zircon, a real mineral and nothing to do with cubic zirconia. Cambodian blue zircon has strong fire and a sparkle close to diamond.
- Blue
- Golden
- White
Star sapphire / ไพลินสาแหรก
Six-rayed stars in blue and black sapphire. Black star sapphire is a Thai specialty, and a sharp, centred star is what drives the price.
- Blue star
- Black star
Pink and padparadscha sapphire / แซฟไฟร์สีชมพู และพัดพารัดชา
Pink sapphire for engagement rings and the sunset-coloured padparadscha. With padparadscha, the lab report matters more than with any other sapphire.
- Pink
- Padparadscha
Tourmaline / ทัวร์มาลีน
Neon Paraiba, soft pink and bicolour stones that shift from green to pink in a single gem. No other gem family covers as many colours.
- Paraiba
- Pink
- Bicolour
Amethyst and citrine / อเมทิสต์ และซิทริน
Faceted, ring-grade amethyst and citrine set in gold. These are fine jewellery stones, not beads, and they look their best in larger sizes.
- Amethyst
- Citrine
Cat’s eye chrysoberyl / ไพฑูรย์
The honey-coloured stone with a single line of light across it, and one of the nine nopphakao gems. You pay for a sharp, centred eye that opens and closes under light.
- Honey
- Milk and honey
How we sell natural stones
Treatments disclosed
Heated, unheated, oiled or untreated: we write it on your invoice before you pay, not after.
Independent lab reports
Any stone can go to GIT or AIGS in Bangkok. Both labs are a short walk from our office.
See it at JTC first
Book a time at the Jewelry Trade Center on Silom, look at the stone in daylight, then set it here or take it loose.
Questions buyers ask
Is it safe to buy gemstones in Bangkok?
Yes, if you buy from an established dealer and never from a shop a stranger or tuk-tuk driver takes you to. Ask for the treatment in writing and a lab report from GIT or AIGS on any important stone.
Do you sell lab-grown stones too?
Yes, but never mixed up with natural ones. These pages are natural stones only. Our lab-grown range has its own pages and every lab stone is labelled as lab-grown.
Can I buy a loose stone and have it set in Bangkok?
Yes. You can buy the stone loose or have it set in 10k, 14k or 18k gold. Most custom pieces take one to three weeks, and we ship worldwide.
Why are some natural stones so much cheaper than others of the same colour?
Treatment, clarity, origin and cut. An unheated stone with a lab report can cost several times a heated stone that looks similar, which is why we put the treatment in writing.
Looking for a specific stone?
Tell us the stone, colour, size and budget. We source from dealers across JTC and send photos and videos before you commit.