Learning Center

Gemstone Treatments

All about gemstone treatments including heating, bleaching, surface coating and more.
Gemstone Coatings: CVD and More

Gemstone coatings are a simple way to enhance color and luster. Learn about commonly coated gems, different coating techniques, and how to detect…

Corundum Treatments

Many techniques have been developed to enhance the appearance of Corundum gems. Some of the treatments are very subtle, invisible even with a loupe.…