Education

Buying Wholesale Coloured Gemstones in Bangkok:...

Why Bangkok? Bangkok has been one of the world's great trading centres for coloured gemstones for decades. Stones mined across Asia, Africa and South America come here to be cut,...

Fire in Gemstones: What Dispersion Is and Why I...

What Is Dispersion? White light looks colourless, but it is actually a blend of every colour in the rainbow. When light enters a cut gemstone, it slows down and bends,...

Emerald Clarity Enhancement: What F1, F2 and F3...

If you have looked at emeralds for long, you have seen F1, F2 or F3 on a lab report, or the words minor, moderate and significant in a listing. These...

Cat's-Eye Gemstones: How Chatoyancy Works, and ...

Some gemstones seem to carry a band of light that glides across their surface as they move, like the eye of a cat. The effect is called chatoyancy, and it...

Heated vs Unheated Sapphires: What the Differen...

Ask anyone in the trade what separates a good sapphire from a great one, and treatment will come up within a minute. Most sapphires on the market have been heated....

How to Read a Gemstone Lab Report: What It Tell...

When you buy a fine coloured stone, the report that travels with it matters almost as much as the stone itself. Collectors and trade buyers use it to confirm what...