New Azurite-Malachite Mixture from Peru
A Peruvian source yields a new azurite-malachite mixture.
Celebrating 50 Years of Tsavorite
An exhibit at the 2017 AGTA Tucson Gem Fair celebrates the work of Campbell Bridges.
Two Natural Type IIa Diamonds with Strong Phosphorescence and Ni-Related Defects
Natural diamonds exhibit characteristics normally seen in synthetic material.
Filled Pearl with Surface Features
A pearl, thought to be natural, is revealed to be a bead-cultured specimen with a pre-drilled nucleus.
Coated Beryl Imitating Emerald
Coating on a beryl demonstrates the importance of thorough examination of jewelry and gem materials.
Preliminary Observations on Facet-Grade Ruby from Longido, Tanzania
Microscopic observation and trace element analysis is performed on rubies from Longido.
GSA 2017 Annual Meeting
Experts shared the latest research on gemstones at the Geological Society of America annual meeting in Seattle.
World of Gems Conference
A report from the fifth World of Gems Conference, held September 23–24 at the Loews Hotel in Chicago.
The Foxfire Diamond, Revisited
The 187.63 ct rough diamond from Canada’s Diavik mine shows surprising reactions to ultraviolet light.
Interesting Growth Structure in Black Diamond
Observations on a black diamond with an unusual inclusion pattern lead to theories on growth.