笔者从未遇到过如此有激情的旷工群体，他们对于开采澳大利亚蛋白石非常热爱。 摄影：Andrew Lucas（安德鲁·卢卡斯）/GIA。 小心蛋白石虫！它是爱虫的近亲，一旦被咬，谁也逃脱不了。 —Len ...

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 ...

GIA is proud to provide the most comprehensive research in the industry with a world-renowned field gemology team and a dedication to acquiring colored stones directly from the source. Our ...

11月生まれの方は、2つの美しい誕生石、トパーズとシトリンからお好きなものを選ぶことができます。トパーズには虹のように様々な色があります。そしてシトリンには魅力的な黄色や ...

CARLSBAD, California – September 23, 2024 – Everything retailers and their customers need to know about diamonds just got easier to find and understand with GIA’s redesigned consumer-facing website ...

Ruby is the July birthstone – and it’s one of the most coveted of gems. The name is derived from the Latin word ruber, meaning “red” – the color of love and passion. Few things catch the eye like the ...

Pictured above, a South Sea cultured pearl containing an RFID tag, an RFID reader, and a GIA Cultured Pearl Classification Report describing the RFID reference number. Fukui Shell Nucleus Factory uses ...

Reviews the advancements and major trends in laboratory-grown diamonds observed by GIA since 2007. Gemological and Trace Element Characteristics of Cassiterite from Yunling, China Examines gem-quality ...

Search a city or postal code to find retailers who carry GIA-graded diamonds or have GIA-trained staff. Results will include addresses, store hours and directions. Store hours reflected on Retailer ...

This large Australian light opal cabochon weighs 117.85 carats. Small play-of-color flashes of orange and green predominate in a pinfire pattern, with spots of a more muted blue over a grayish ...

GIA is the world’s most trusted name in diamond grading and gem identification. With objectivity and expertise as its hallmarks, GIA ensures the integrity and accuracy of every report it issues. GIA ...

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 ...