Fissure with Moiré Pattern in Spinel
A precipitation of an unidentified mineral creates a complex moiré pattern in a fissure of a purple spinel.
Translucent Ruby Filled with Zinc Glass
Solid Laboratory-Grown Single-Crystal Diamond Ring
The quality and size of this 4.04 ct CVD-grown diamond ring demonstrate the advancing technology in laboratory-grown diamonds.
GIA、2024年に革新的プログラム ＜グラジュエート・ジュエラー・プログラム＞を開始
（GIA は、2024年に、グラジュエート・ジュエラー・ディプロマ・プログラムをリニューアルして開始します。
GIA招聘會10月6日在加州卡爾斯巴德舉行
寶石學研究、教育和鑑定所服務先驅GIA美國寶石研究院，將於10月6日星期五在加州卡爾斯巴德的全球總部主辦Powered by GIA招聘會。活動將帶來非凡體驗，並有專人提供就業指導。參加者可暢談交流，並有機會接觸業內知名企業的招聘人員，拓展重要的人脈網絡。
Career Fair Powered by GIA in Carlsbad on Oct. 6
GIA, a pioneer in gemological research, education, and laboratory services, is set to host Career Fair Powered by GIA on Friday, Oct. 6 at the Institute’s World Headquarters in Carlsbad, California.
GIA Supports Diamond Traceability Solutions
As consumer and government demand increases for credible country-of-origin information for polished diamonds, GIA, whose mission is to protect consumers and ensure their trust in gems and jewelry, supports all workable solutions that will provide that vital information.
Gemological Institute of America's Carlsbad Campus Receives School of Excellence and Excellence in Student Services Awards
GIA’s Carlsbad campus was recognized by the Accrediting Commission of Career Schools and Colleges (ACCSC) as an ACCSC 2023 School of Excellence.
GIA Adds ‘Hanadama’ Quality Range Comment to All Pearl Classification Reports
GIA is adding a report comment for the historical trade term 'Hanadama' to distinguish a designated quality range of cultured Akoya pearls.
Spring 2022 Auction Highlights
Large near colorless, blue, and yellow diamonds broke auction records at Christie’s and Sotheby’s in the first half of 2022.
Combination of Phenomena in Star and Cat’s-Eye Color-Change Sapphire
Both asterism and chatoyancy are observed in a color-change sapphire.
Solid Laboratory-Grown Single-Crystal Diamond Ring
The quality and size of this 4.04 ct CVD-grown diamond ring demonstrate the advancing technology in laboratory-grown diamonds.
Susan Jacques Receives Robert M. Shipley Award
GIA president and CEO Susan Jacques receives the American Gem Society’s highest honor.
Guest in Garnet: Metal Sulfide?
An intriguing metallic inclusion is observed in a faceted garnet.
2023 Sinkankas Symposium
The Nineteenth Annual Sinkankas symposium, held at GIA’s Carlsbad, California campus, focused on gems and minerals of San Diego County.
CVD Diamond Over 34 Carats
Interesting Metallic Platelets in a Brazilian Paraíba Tourmaline
Microscopic observation unveils the first known instance of skeletal metallic inclusions in Brazilian Paraíba tourmaline.
A Fascinating Large South Sea Bead Cultured Pearl
An exceptionally large South Sea bead cultured pearl is examined at GIA’s Mumbai laboratory.
Rainbow Mountain in Natural Diamond
An iridescent feather inclusion in natural diamond bears resemblance to Rainbow Mountain in Peru.
An Iridescent “Insect Wing” in Diamond
A feather inclusion with iridescence caused by thin-film interference in diamond resembles an insect wing.
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