10月生まれの方は、誕生日を祝福するのに2つの素晴らしい誕生石、オパールとトルマリンをお楽しみいただけます。10月の誕生石は、両方とも無限の色の組み合わせを持ち、美しい色を ...

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 ...

Diamond color is all about what you can’t see. Diamonds are valued by how closely they approach colorlessness – the less color, the higher their value. (The exception to this is fancy color diamonds, ...

CARLSBAD, California – January 14, 2025 - The Gemological Institute of America (GIA) has announced the planned retirement of its president and CEO, Susan Jacques, at the end of 2025. The Institute has ...

Cubic zirconia can be produced in large sizes and in different colors. These colorless and pinkish purple CZ are, from left to right, 44.49 carats, 29.86 carats and 54.60 carats. Photo: Tino Hammid.

"The Path of Enlightenment" necklace contains 180 magnificent opals from Lightning Ridge, Australia, a famous opal producing area. - Courtesy Cody Opal Opal is the product of seasonal rains that ...

The Graduate Jeweler diploma program is a hands-on experience that introduces students to the knowledge and skills required for a career in jewelry fabrication and repair. You will work with gemstones ...

With a reach that spans the globe, GIA is a nonprofit institute dedicated to protecting consumers by ensuring their trust in gems and jewelry through cutting edge gemological research, rigorous ...

周大福（Chow Tai Fook）是一家从生产到零售的垂直一体化的珠宝公司。 其价值链包括最先进的钻石切工。 摄影：GIA的Pedro Padua（佩德罗·帕多瓦）版权所有 ，由周大福（Chow Tai Fook）、裕顺福 ...

Trio of carved green tourmaline dolphins on frosted quartz base. Carved by Gerhard Becker. Gift of John Staver, GIA Collection. Photo by Orasa Weldon. In 1972, an immense pocket of superb tourmaline ...

Figure 1. Swat emeralds are internationally renowned for their bright colors, even in small stones such as these, ranging from 0.3 to 0.8 ct. Photo by Hongshu Guo. Pakistan’s production of emeralds ...

タイプIIaのLesedi la Rona（レセディ・ラ・ロナ）ダイヤモンドはボツワナにあるLucara（ルカラ社）のカロウェ鉱山で採鉱され、1,109カラットの宝石品質で、史上二番目に大きな宝石品質の ...