以下是 GIA 将休业的法定假期列表。 2025 年 5 月 5 日（星期一） 玛哈•哇集拉隆功国王陛下加冕（补假） 2025 年 5 月 12 日（星期一） 卫塞节（补假） 2025 年 6 月 3 日（星期二） 王后陛下诞辰 2025 年 7 月 10 日（星期四） 守夏节 ...

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The authors examine the gemological properties and commercial potential of a new source of amber, discovered in 2020 on the Vietnamese island of Phu Quoc. It is the only known amber locality in ...

Reports and Services available for jewelry.Jewelry Report Designed for clients who seek in-depth insights into every aspect of a jewelry item. Comprehensive analysis of the diamonds in an item, ...

ONLINE EDUCATION PAYMENT PLANS Tuition payment plans are available for the online courses listed below with the first installment and a non-refundable $35 plan administration fee due at the time of ...

In general, 2025 was a strong year for Tucson vendors at the various shows. Like last year, foot traffic was generally low with moments of high activity, while buying remained focused. Vendors who ...

At the GJX show, Pillar & Stone (San Francisco, California) offered bright green jade from Guatemala, confirmed to range from jadeite to omphacite, that was highly translucent to nearly transparent.

Many unusually large South Sea cultured pearls have been identified at GIA laboratories in the past (e.g., Fall 2013 Lab Notes, pp. 172–173; Summer 2023 Lab Notes, pp. 216–217). However, a recent ...

Figure 2. Representative deep-UV fluorescence image of a 2.90 ct CVD diamond from Plasmability, collected using the DiamondView. The image is dominated by red–orange fluorescence from NV 0 centers, a ...

Sample reports for the Jewelry Services ReportGIA Jewelry Reports are designed for clients who seek in-depth insights into every aspect of a jewelry item. Comprehensive analysis of the diamonds in an ...

GIA’s Bangkok laboratory received for identification a set of 35 loose non-nacreous pearls displaying a wide range of bodycolors including white, orange, pink, brown, purple, and black. The pearls ...

At the AGTA show, the author spoke with Brent Smith, owner of Phoenix Gems (Holly, Michigan), who shared a few parcels of rough spinel of different colors recently mined in Malawi. According to Smith, ...