Color Modification of Spinel by Nickel Diffusion: A New Treatment
Reports on a newly discovered treatment process for producing a deep blue color in natural spinel and proposes identification criteria.
Fire Obsidian’s Beguiling Spectrum
A look at a rare volcanic glass from central Oregon with lapidary artist Tom Dodge.
Origins of Color in Brown Mammoth Ivory
Investigates the mineral and chemical compositions and surface morphology characteristics of brown mammoth ivory to identify the origins of its brown color.
Gem-Quality Augite from Dong Nai, Vietnam
Offers a comprehensive look at a variety of augite from Dong Nai, Vietnam, detailing its formation and gemological characteristics.
Gems Formed in Metamorphic Rocks
Gemstones formed in metamorphic environments offer insights into the earth’s history and the evolution of tectonic activity that led to their formation.
Fine Linear Structures in Non-Bead Cultured Pearls
Analysis of internal structures in non-bead cultured pearls submitted to GIA’s Mumbai laboratory.
Natural Diamond with CVD-Like Fluorescence Pattern
Examination of a natural diamond reveals graining and zoning that resemble those of a laboratory-grown CVD diamond.
Two Pearls of Indian Cultural Significance
Two pearls representing Indian deities were recently examined in the Mumbai laboratory.
An Unusual Metallic Core in a Natural Pinctada radiata Pearl from Kuwait
Examination of natural pearls from Kuwait reveals one with a suspected metal oxide at the core.
Pink Sapphire with Graphite Inclusion
A hexagonal platelet of graphite is discovered in a pink sapphire from Sri Lanka.
Gems Formed in Metamorphic Rocks
Gemstones formed in metamorphic environments offer insights into the earth’s history and the evolution of tectonic activity that led to their formation.
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.
Spring 2023 Auction Highlights
After a slow start, the spring 2023 auction season ends with multiple broken records.
Industry Leaders Explore Purpose and Resilience at GIA Global Leadership Program at Harvard Business School
41 leaders from every global gem and jewelry sector gathered recently for a transformative educational experience at the 2023 GIA Global Leadership Program at Harvard Business School (HBS)
行业领袖在哈佛商学院GIA全球领导力课程上探讨产业目标和韧性
41 leaders from every global gem and jewelry sector gathered recently for a transformative educational experience at the 2023 GIA Global Leadership Program at Harvard Business School (HBS)
GIA发表首份可持续发展报告
GIA总裁兼首席执行官苏珊·雅克（Susan Jacques）于6月2日星期五在拉斯维加斯举行的JCK 珠宝展宣布GIA将发表首份可持续发展报告，她表示：「GIA需要透彻了解我们对环境、社会及业务所在社区的影响，在此重要的基础上履行保障消费者的重要使命。」
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