Examination of commercially-available “shell pearls” reveals imitation material.

A Fancy yellow type Ib CVD-grown synthetic diamond undergoes testing at the New York lab.

A natural diamond with a CVD synthetic film is examined at GIA's Carlsbad lab.

An opal featuring a rare six-rayed star is examined in GIA's Bangkok lab.

Color modification is observed in a reddish orange zircon at the Bangkok laboratory.