Bismuth Glass-Filled Burmese Star Ruby
The Hong Kong laboratory recently examined a Burmese star ruby incorporating a significant amount of bismuth glass.
Diamond with Cavities Showing Radiation Evidence
Diamond formed at incredible depth shows evidence of radioactive fluids in cavities surrounded by green fluorescence halos.
Solid Carved Dark Gray Diamond Ring
A ring made entirely of natural diamond was recently submitted to GIA’s New York laboratory.
Formation of the “Matryoshka” Diamond from Siberia
A freely moving diamond crystal completely enclosed in a diamond from Siberia gets its name from the famous Russian nesting dolls.
A Fossilized Shell Blister and Blister Pearl
Two fascinating fossilized blister pearl specimens possibly 86 million years old reveal insights into ancient mollusks.
Saltwater Bead Cultured Pearl with Laminated Nucleus
The Bangkok laboratory recently examined a pearl containing a laminated shell bead nucleus with mysterious properties.
Fluorescence Spectroscopy for Colored Pearl Treatment Screening
A nondestructive rapid screening technique uses fluorescence spectroscopy to identify treated colored pearls.
Corundum Inclusions in Gem Diamond
Rare chromium-rich corundum inclusions in a natural gem diamond provide a window into the deep earth.
Clarity-Enhanced Glass Imitating Emerald
The Carlsbad laboratory recently identified a richly-hued green stone as clarity-enhanced glass.
Graphitic Cavities on Diamond
An unusual series of graphitic cavities discovered on a star facet in a near-colorless round brilliant diamond may be explained by laser sawing.
Unusually Large Grandidierite
The Carlsbad laboratory recently examined a 763.5 ct faceted grandidierite, the largest GIA has seen to date.