A nondestructive rapid screening technique uses fluorescence spectroscopy to identify treated colored pearls.

A freely moving diamond crystal completely enclosed in a diamond from Siberia gets its name from the famous Russian nesting dolls.

Diamond formed at incredible depth shows evidence of radioactive fluids in cavities surrounded by green fluorescence halos.

A ring made entirely of natural diamond was recently submitted to GIA’s New York laboratory.

The Hong Kong laboratory recently examined a Burmese star ruby incorporating a significant amount of bismuth glass.