Synthetic moissanite is much closer to diamond in overall appearance and heft than any previous diamond imitation; this article reports on how to identify and characterize it.

View the holiday schedule for all GIA locations worldwide.

The island of Borneo is one of the oldest known —and least reported on—sources of diamonds. Although diamond mining historically was concentrated in the western area of what is now Kalimantan, recent ...

Field Report Gems & Gemology, Fall 2016, Vol. 52, No. 3 Bead-Cultured and Non-Bead-Cultured Pearls from Lombok, Indonesia Nicholas Sturman, Jeffery Bergman, Julie Poli, Artitaya Homkrajae, Areeya ...

A chemical and spectroscopic comparison of two purple gem spinel samples, one of them the first reported example of a spinel with a saturated purple color caused predominantly by chromium and cobalt.

Figure 1. Pleochroism in a 15 ct tanzanite, as seen with the unaided eye through the crown and the pavilion sides and ends. Photo by Wimon Manorotkul. ABSTRACT While virtually all gemological texts ...

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.

With the increasing use of radiation to color enhance gemstones, the issue of radioactivity has become a source of concern for gemologists worldwide.

To commemorate the 50th anniversary of The Wizard of Oz, Harry Winston created real ruby slippers set with 4,600 rubies. - Courtesy Harry Winston Red is the color of our most intense emotions—love and ...

誕生石「アクアマリン」の意味 & 歴史 アクアマリンの語源はラテン語の「海水」です。古代の船乗りたちには、この宝石が波を落ち着かせ、彼らの海での安全が保たれるのだと言われていました。また、この3月の誕生石は幸せな結婚をもたらすとも考えられていました。ベリル (緑柱石)を身に ...

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 ...

Political upheavals and technological advances, as well as changes in social and governmental attitudes and initiatives, have produced major and ongoing changes in the diamond industry.