Research Article Search Results

Examination of pearls with a dominant purple hue, reportedly from the Spondylus calcifer mollusk.

Reports on the internal features and spectroscopic and trace-element analysis of rubies reportedly from Pokot, Kenya.

Documents the retrieval and testing of P. maxima cultured pearls from a Lombok hatchery.

Studies the formation and chemical composition of the largely unexamined alluvial sapphires from Russia’s Jewish Autonomous District.

Testing of natural-color yellow sapphires from Australia and Thailand with the FTIR features of “Punsiri” heat-treated material.

A summary of the content found in the Fall 2016 issue of Gems & Gemology.

You’ve heard about the 4Cs of diamond quality (color, clarity, cut, carat weight). But how did they become so well-known? Here’s a little diamond history.

Article published in Precambrian Research 286, 152-166.

Natural pearl identification is one of the critical problems in pearl research. The DNA study of pearly mollusks and oysters facilitates solving this problem. To fulfill this goal, GIA sent a group from both research and education to Tennessee to sample the freshwater mollusks for DNA bar coding. Come with us to Camden, Tennessee, to see how we dive for pearly shells.

Visit Montana’s Rock Creek sapphire mining area with a GIA field expedition and witness the recovery of these beautiful stones directly from the source.

Located near the Arctic Circle, Diavik is one of the world’s richest diamond deposits and a leader in sustainable mining.

Examination of shells from on P. mazatlanica proves the similarities between that species and P. margaritifera.