✓ GIA Graduate Gemologist ✓ AJP™ Certified ✓ 15+ Years Bangkok Trade ✓ Family Business Since 1959 ✓ Perfect 5★ Google Rating

Bangkok's Trusted GIA Gemologist

Stop Overpaying for Treated Gemstones Sold as Natural

I'm Tarun Gupta, a GIA-certified gemologist based in Bangkok. I help buyers worldwide source authentic rubies, sapphires, emeralds and diamonds and teach you exactly how not to get cheated.

Get My Free Gemstone Guide → ▶ Watch: Fake vs Real Ruby
2M+ YouTube views
500K+ GIA diamonds sourced
5★ Google & TripAdvisor
65+ Years family in trade
Tarun Gupta, GIA Graduate Gemologist Bangkok
Tarun Gupta
GIA Graduate Gemologist · AJP™
  • Rubies, Sapphires & Emeralds
  • GIA-Certified Diamonds
  • Custom Jewelry Bangkok
  • Treatment Detection & Education
Verified credentials & platforms
Why this matters

The gemstone market is full of traps. Here’s how I protect you.

Buying gemstones without insider knowledge is risky. Most buyers have no way to tell a treated stone from a natural one and unfortunately dealers know it.

✗ The problem

What buyers face without expert guidance

  • Undisclosed treatments Heat, lead-glass filling, or oiling passed off as “natural” at natural prices.
  • Unknown lab certificates Low-quality or fake lab reports used to justify 300 to 500% markups over true wholesale.
  • Bangkok tourist traps High-pressure shops, commission driven “tuk-tuk guides,” and fake government stores.
  • No way to verify quality Without a gemologist’s eye, experience and equipment, buyers can’t spot what dealers hide.

✓ The solution

What GIA-certified expertise gives you

  • Free treatment education Ruby, sapphire & emerald treatment guides with microscope videos showing exactly what to look for.
  • GIA-standard sourcing Access to 500,000+ GIA-certified diamonds and vetted colored stone suppliers at wholesale prices.
  • Unbiased expert consultation 1-on-1 guidance before you buy anywhere from someone with no sales incentive to mislead you.
  • 65 years of trade relationships Three generations in the Bangkok gem trade means access that no retail store can offer.
How I can help

Three ways to work with me

Whether you’re buying your first gemstone, designing a custom ring, or just want to learn, there’s a place to start.

Gemstone Guide

Ruby, sapphire and emerald treatment guides written by a GIA gemologist. Know exactly what you’re buying and what questions to ask before you spend a dollar.

Read the Free Guide →

Custom Jewelry

Source your gemstone or diamond at wholesale, then craft it into a bespoke ring, pendant or earrings in Bangkok’s finest 14K or 18K gold and platinum factories.

See Custom Creations →

Expert Consultation

Not sure if a deal is legitimate? Send me the details and I’ll give you an honest, unbiased assessment. No sales agenda just 15 years of gemologist experience.

Book a Consult →
2 Million+ YouTube Views

Our most-watched gemstone guides

These free tutorial videos have helped hundreds of thousands of buyers worldwide spot treatments, understand pricing, and make smarter decisions.

▶ 260K+ views
Ruby

Unheated Ruby vs Lead Glass Filled Ruby

See the difference between a premium unheated ruby and a cheap composite ruby examined under a gemologist’s microscope.

▶ 180K+ views
Emerald

Emerald Treatment Guide: No Oil to Moderate Oil

Learn to identify no-oil, insignificant, and moderate-oil emeralds and what those distinctions mean for price.

▶ 190K+ views
Ruby

How Much Does a One Carat Ruby Actually Cost?

A frank walkthrough of the 4Cs + Origin + Treatment framework and what they mean for real-world ruby pricing.

Client reviews

What buyers around the world say

Perfect 5-star ratings on Google and TripAdvisor from clients across Europe, Asia, Australia and the Americas.

★★★★★
“Tarun navigated me through choosing a ruby without the pressure. Gave me a wealth of knowledge to help me make the right choice for my expectations.”
Phil Dale
Australia · Google Review
★★★★★
“I have wanted a sapphire ring for a long time and I couldn't be happier with this ring Tarun has made for me. Tarun has been exceptionally professional and provided a service above and beyond my greatest expectations. Communication with him quickly erased my initial reservations about ordering such a piece of jewellery online.”
Krista N.
Sicily, Italy · TripAdvisor
★★★★★
“I found Tarun on google and he was very receptive. I told him exactly what I was looking for in an engagement ring and he was able to search through his deep connections in Bangkok to source a beautiful 2 carat sapphire.”
Paul Merriott
United States · Google Review
⭐ Perfect 5.0 on Google 📍 Rated Excellent on TripAdvisor ▶ 2M+ YouTube Views 🎓 Verified GIA Alumni
Tarun Gupta, GIA Graduate Gemologist, Bangkok

The person behind the site

Tarun Gupta

🎓 GIA Graduate Gemologist · AJP™

My grandfather founded Thai Native Gems in Bangkok in 1959. He was the undisputed wholesale source for most dealers across Asia for over two decades. Gemstones are in my blood.

Before joining the family business, I earned my GIA Graduate Gemologist degree. So when I say I can spot a lead-glass filled ruby from a natural one under a microscope, that’s not a marketing claim it’s a credential you can verify.

I started this blog because I kept seeing the same story: honest buyers getting cheated by dealers who exploit the knowledge gap. My job is to close that gap through free education, treatment guides, YouTube videos, and personal consultations.

Verify my GIA credentials on the official alumni directory →
Free insider knowledge

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