Professional Gemologist Certification Course
Gem Price Guide
The IGS Gem Price Guide covers commonly traded colored gems as well as more unusual, collectible gems. Prices are retail in US dollars. Unless otherwise noted, all prices are for cut gems and all weights are in carats. Learn How to Use Our Gem Price Guide
International Gem Society
When you join the IGS community, you get trusted diamond & gemstone information when you need it.
Get started with the International Gem Society’s free guide to gemstone identification. Join our weekly newsletter & get a free copy of the Gem ID Checklist!