Research & News
Natural Diamond Mistaken as HPHT Synthetic
Declared synthetic diamond identified as natural in the Carlsbad lab.
Prismatic Rutile in Quartz
A rock crystal quartz displayed a large, well-formed rutile crystal inclusion under the table.
Coated Pink Synthetic Moissanite
A pink synthetic moissanite is coated with a thin colored film, raising questions about the natural origin of its color.
The Largest Diamond Discovered in North America
GIA examines a 552.7 ct diamond from the Diavik mine in Canada.
Zircon Cluster in Ethiopian Sapphire
The presence of these zircon clusters might help separate Ethiopian sapphire from other basalt-related sources.
Crowningshieldite: A New Mineral
A newly discovered mineral, crowningshieldite, was accepted on September 18, 2018, by the International Mineralogical Association.