What are Gemstone Enhancements? - International Gem Society

Gemstone enhancements improve the appearance and wearability of gems. Learn about the most commonly used procedures and frequently treated types of gems.

GRS GemResearch Swisslab AG - The Leader in Colored Gemstone Reports

What are Gemstone Enhancements? - International Gem Society

Evaluating Gemstone Color

989,446 Gemstones Images, Stock Photos Vectors Shutterstock

Bolivian Ametrine Starbrite™ Cut 43.70 carats

Emeralds - History's Favorite Stone? Learn more on !

The good gem guide

Gemstone - Wikipedia

An Introduction to Gem Treatments