Research Article Search Results

A gemological analysis of blue Burmese sapphires from Mogok, based on a series of field expeditions over the last decade.

The Carlsbad lab recently encountered a 2.42 ct green diamond showing signs of radiation treatment by the use of radioactive salts.

Distinguished research fellow Dr. James Shigley receives the Robert M. Shipley Award for his contribution to the science of gemology.

Although spinel is rarely treated, there have been some heated spinels available in the trade.

A colorless topaz from Nigeria hosts the only known example of willemite as an inclusion in topaz.

The Tokyo lab examined a stunning double cat’s-eye emerald whose chatoyancy was created both by its cut and its inclusions.

A group of large, high-quality CVD material demonstrates the continued challenge of identifying laboratory-grown gems.

Creative faceting highlights an octahedral-shaped cloud inclusion in a 2.01 ct diamond octahedron.

Recently, a 23.67 ct pear cabochon aquamarine with light greenish blue color and poor clarity was sent to the Taiwan Union Lab of Gem Research (TULAB) for identification.

A study on heat with pressure treatment of blue sapphires reveals FTIR patterns associated with different iron concentrations.

Careful comparison of two GIA reports reveals a fraudulent inscription on a laboratory-produced diamond presented as a natural.

Reports on the geology, background, and current state of mining and production at Iran’s largest turquoise mine.