Spinel: A Buyer's Guide
The balas ruby of crown jewels. A brilliant, almost never treated stone that rivals ruby at a fraction of the price.
Notes From The Gemologist
Buyer’s guides and field notes on colour, treatment and provenance, so you can judge a stone the way we do.
4 articles
Ruby: A Buyer's Guide
Why one red stone costs $200 and another $200,000. Reading ruby colour, treatment, and what to ask before you buy.
Blue Sapphire: A Buyer's Guide
Cornflower, royal, Ceylon. What the colour names really mean, how sapphire is priced, and the treatments to ask about.
Emerald: A Buyer's Guide
Green, included, and almost always oiled. How to judge emerald colour, read its jardin, and care for a stone that needs it.