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 ...

Whether you’re taking the next step in your professional journey or starting a new career, GIA courses and diploma programs prepare you for success. We offer the finest gem and jewelry education in ...

The June Hong Kong Jewellery & Gem Fair opens on June 22, a mid-year trading event for the gem and jewelry trade. Visit GIA at booth 3M100. Learn about sales tools, aids and apps available through the ...

While Federal financial aid is not available for Online Education students, GIA-administered scholarships and payment plans for selected online courses are. GIA scholarship application cycle is from ...

Having visited the Chinese markets processing and selling this Guatemalan material in Jieyang and Guangzhou, Heng reported that one of the largest miners was sending approximately 8 tons of rough each ...

For the first time ever, the famous Hope diamond was graded by a widely recognized system. Although the 45.52-ct weight was confirmed, the GIA Gem Trade Laboratory graders found the clarity—recently ...

Designed for clients who seek in-depth insights into every aspect of a jewelry item. Comprehensive analysis of the diamonds in an item, including number of stones, shape, estimated carat weight, color ...

This specimen represents one of the largest cultured pearls tested by GIA from the Pinctada maxima mollusk.Pinctada maxima is the largest species in the Pinctada genus, typically producing 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, ...

加利福尼亚州卡尔斯巴德– 2025 年 6 月 2 日 – 在今年稍后时间起，gia（美国宝石研究院）将使用描述性术语来表征实验室培育钻石的品质，不再使用为天然钻石制定的颜色与净度命名系统来为实验室培育钻石进行分级。gia将继续提供实验室培育钻石的评估与鉴定服务。

GIAの教育. 意欲と知識を組み合わせれば、宝石やジュエリーに対する情熱が高まります。宝石学における世界有数の権威として認められているGemological Institute of Americaで学び、業界への扉を開くディプロマを取得しましょう。

Figure 1. In most cases, transparent gemstones owe their color to selective absorption of light. In the case of a yellow diamond, the blue portions of the incident white light are absorbed by the ...