Malaya garnets from Bekily, Madagascar, are predominantly pink to pinkish orange, with some stones orange to red. Discovered only in the late 1990s, the majority are intermediate members of the pyrope ...

Established in 1931, the Gemological Institute of America (GIA) is the world’s foremost authority on diamonds, colored stones, and pearls. A public benefit, nonprofit institute, GIA is the leading ...

A highly saturated purplish pink to red pezzottaite from a new deposit in Madagascar is encountered in Tucson and tested by GIA researchers.

With the withdrawal of Soviet troops from Afghanistan, villagers in the Panjshir Valley are turning their attention to the emerald riches of the nearby Hindu Kush Mountains.

Emerald is the May birthstone – and it’s a perfect choice. Its enchanting greens mirror the splendor of spring. Few places on earth have the geologic conditions needed to produce the coveted May ...

Discusses the role of three-phase inclusions in emerald, in combination with spectroscopy and trace-element analysis, in determining geographic origin.

Imitation diamonds such as CZ and moissanite have been popular for decades. Learn about their properties and how they compare to diamonds.

Documents a series of visits to Myanmar in search of exceptionally bright pinkish red spinels possessing no dark tones.

Opal is known for its unique display of flashing rainbow colors called play-of-color. There are two broad classes of opal: precious and common. Precious opal displays play-of-color, common opal does ...

To do sizing work, bench jewelers use a steel ring mandrel made of tapered, milled steel; and marked in quarter, half, and whole sizes (0.2 mm, 0.4 mm and 0.8 mm, inside diameter respectively). All ...

The GIA App contains a wealth of diamond resources, including 4Cs interactive tools, and expert articles and videos. Additionally, within the GIA App you can access reports in GIA’s secure database ...

This 10.12 ct Fancy Vivid yellow pear shape illustrates the effect a fancy shape can have on intensifying the color in a yellow diamond. - Courtesy the Scarselli Family Color In diamonds, rarity ...