Learning Center

Gemstone Treatments

All about gemstone treatments including heating, bleaching, surface coating and more.
Difficult Gemstone Separations

Two of the trickiest gemstone separations to make are scapolite from citrine and apatite from tourmaline. Learn some tips for distinguishing…

Aquamarine Color and Heat Treatment

There’s more to aquamarine color than blue. Most natural stones start blue-green and are heated to blue. Learn the pros and cons of this treatment.…

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.…