A new and rather unusual gem material and possible treatments are discussed.

How amethyst under certain conditions may turn green rather than the expected citrine-yellow.

GIA researchers explore the differences between whole, blister, and shell blister pearls in this study using 33 samples from Pinctada maxima mollusks recovered off Broome, Australia.

Review of Gem Testing Techniques by Alan Hodgkinson.

How variations in UV lamp output can affect observed fluorescence color and intensity.

A Guatemalan jade called yongchuliao has gained popularity among Chinese buyers.

A report on the seventh annual Chicago Responsible Jewelry Conference.

Explores eclogitic diamonds, which make up a significant portion of the gem diamond market, and what they reveal about Earth’s dynamic processes.

Examines dissolution features of heliodor and green beryl from a Ukrainian pegmatite field and offers criteria to distinguish them from samples found in other localities.

The DiamondView instrument is able to identify glass as the filler in a pair of heart-shaped rubies.