Criteria for distinguishing emerald filling substances were investigated. Thirty-nine fillers were divided into six substance categories—three “presumed natural” (essential oils [including cedarwood ...

One of the most famous gems in the world, The Hope Diamond is a 45.52 carat Fancy Deep grayish blue diamond. GIA researchers examined it in 1988. Photo: Chip Clark, courtesy of Smithsonian Institution ...

GIA Instruments works hand-in-hand with GIA’s laboratory, education and research teams, as well as the jewelry trade to develop the instrumentation you need to prepare you for the challenges of ...

Results from spectroscopic analyses of GE POL high-pressure high-temperature (HPHT) annealed nominally type IIa diamonds are presented, and these spectral characteristics are compared with those of ...

Pink-to-red coral has a long history as an ornamental gem material in jewelry, carvings, and sculptures. However, due to a variety of environmental and legal factors, the supply of high-quality, ...

The separation of naturally colored lavender jadeite from color-treated material is a problem that has long plagued gemologists. One theory is that the dyeing agents being used are of an organic ...

A potential new synthetic gem material in the form of a faceted 0.88 ct brownish yellow nano-polycrystalline diamond (NPD) has undergone a full gemological examination, including detailed ...

Gem-quality rubies and fancy-color sapphires have been recovered from dolomite marble lenses located high in the Himalayan mountains of east-central Nepal (Ganesh Himal). First discovered in the early ...

加州 卡尔斯巴德市 —— 2025 年 1 月 14 日 —— 美国宝石研究院 (GIA) 宣布其总裁兼首席执行官 Susan Jacques 计划将于 2025 年年底卸任。研究院正在全球物色继任人。 GIA 理事会主席 Lisa Locklear 表示：「对 GIA 乃至全球宝石和珠宝行业而言，Susan Jacques 是一位杰出的 ...

カリフォルニア州カールズバッド ー 2025年1月14日 ー 米国宝石学会（GIA）は、Susan Jacques社長兼CEOが2025年末で引退する予定であることを発表しました。当機関は後継者をグローバルに探し始めました。 「Susan JacquesはGIAと世界の宝石・宝飾品業界にとって ...

Gem-quality turquoise is currently being mined in Hubei Province, China. The material ranges in color from light blue to bluish green; it usually occurs as nodules 1 to 5 cm in diameter, although much ...

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