How to Buy Gemstones
Without Getting Cheated
A no-nonsense guide from a GIA Graduate Gemologist with 65 years of family trade in Bangkok. Rubies, sapphires, emeralds, treatments, certifications. All of it.
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From Tarun Gupta at buygemstone.info
What’s inside the guide
9 sections. Everything you need before you spend a dollar.
What determines a gemstone’s value
The Four Cs, origin, and why treatment changes everything.
Why treatments change everything
The difference between $10 per carat and $10,000 per carat.
Ruby treatment guide
Unheated, heated, flux-healed, lead-glass filled. What each means for price.
Emerald treatment guide
Why 99% of emeralds are treated and what to look for on a certificate.
Sapphire treatment guide
From natural to lattice diffusion to composite. The full spectrum.
Which labs to trust
GIA, GRS, AGL, Gubelin. When each matters and when local labs suffice.
How to buy in Bangkok
Where to go, what Bangkok is NOT good for, and how to negotiate.
Your buying checklist
8 checkpoints to run through at any dealer, anywhere in the world.
Diamonds: the short honest version
What matters for engagement rings and why Bangkok is not a diamond deal.
