This jadeite "Peiyao" (Chinese Fu dog) represent mythological creatures that guard and protect celestial palaces and entrances. - Gift of Sophie Leu Jade has been cherished for thousands of years.

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.

In 2009, GIA bestowed its highest honor, the Richard T. Liddicoat Award for Distinguished Achievement, on longtime chief research gemologist John I. Koivula. The award was based on his contributions ...

Stability Alexandrite is stable under normal wearing conditions, which means it’s resistant to the effects of heat, light, and common chemicals. Cleaning Warm, soapy water is always safe for cleaning ...

Downloadbable charts and booklets to help you understand the GIA Cut Grading System and how to make the best use of it in your business.

GIA’s New York campus, located in the Diamond District, offers cutting-edge facilities and connects students to the world’s largest diamond market and jewelry industry.

カットの品質は、ダイヤモンドのファイアー、きらめき、および輝きを増幅させる要因です。 際立つダイヤモンドの美しさや魅力は、何よりもカットの品質に左右されます。 DからZの色範囲で表される標準ラウンド ...

You may use the GIA Alumni Online Directory to locate a GIA graduate. The search results will return those graduates who have opted to have their information displayed online. If no results are ...

这颗克什米尔蓝宝石拥有强烈的天鹅绒般蓝色。——摄影：Robert Weldon（罗伯特·韦尔登）/GIA。 蓝宝石是有色宝石三巨头之一，另外两种是红宝石和祖母绿。人们把这种坚固的宝石定为 九月生日石，它以实用性和浪漫气息吸引了众多珠宝买家。 红宝石和蓝宝石均属于刚玉矿物。红色的刚玉称为红 ...

For centuries, Afghanistan has been an important source for top-quality lapis. Historians believe the link between humans and lapis lazuli stretches back more than 6,500 years. The gem was treasured ...

Stability Abrupt temperature changes can cause amethyst to fracture. Some amethyst color can fade with prolonged exposure to intense light. Amethyst can also be damaged by hydrofluoric acid, ammonium ...