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.
A Red Herring in a Red Garnet
Transparent crystal inclusions and gas bubbles are observed in a garnet-topped doublet.
Blackish Green Omphacite Jade from Guatemala
A Guatemalan jade called yongchuliao has gained popularity among Chinese buyers.
Aquamarine with Zigzag Growth Line Inclusions
Zigzag lines are observed only with oblique light in a 55 ct aquamarine.
Inclusion Resembling a Gada in Diamond
An etch channel in the crown facets of a diamond resembles a mace-like weapon.
Etch Features Reveal the Morphology of Diamond
Trigons and tetragons observed in a chameleon diamond indicate both octahedral and cubic growth.
Eclogite: Diamond-Encrusted Ancient Seafloor
Explores eclogitic diamonds, which make up a significant portion of the gem diamond market, and what they reveal about Earth’s dynamic processes.
Yellow Sapphire: Natural, Heat-Treated, Beryllium-Diffused, and Synthetic
Investigates the various chromophores responsible for color in four types of yellow sapphire.
Iolite from the Thor-Odin Dome, British Columbia, Canada: Geology, Chemical Composition, Inclusions, and Cause of Chatoyancy
Reports on the geological setting and gemological properties of violet-blue gem cordierite from new deposits located in British Columbia.
Etch Pits in Heliodor and Green Beryl from the Volyn Pegmatites, Northwest Ukraine: A Diagnostic Feature
Examines dissolution features of heliodor and green beryl from a Ukrainian pegmatite field and offers criteria to distinguish them from samples found in other localities.
Special Colors and Optical Effects of Oregon Sunstone: Absorption, Scattering, Pleochroism, and Color Zoning
Details the colors and optical effects caused by metallic copper inclusions in this gem-quality feldspar.
Cause of Color in Yellow Sapphire, Plus Characterization of Oregon Sunstone, Ukrainian Beryl, and British Columbian Iolite
An overview of the Fall 2023 Gems & Gemology content.
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。
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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。
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.
Combination of Phenomena in Star and Cat’s-Eye Color-Change Sapphire
Both asterism and chatoyancy are observed in a color-change sapphire.
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.
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