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 ...

GIA's legacy of rigorous standards, deep expertise, and advanced technology is now available for jewelry. Submit your item for a comprehensive, convenient Jewelry Report ...

GIA studied more than 400 important gemstones from the Gübelin Collection and is committed to sharing this repository of gemological information. This work is a valuable resource for all students, ...

Attain your dreams of a GIA education with scholarships. We encourage on-campus students to apply for assistance and we are happy to help you coordinate your efforts. GIA-administered scholarships are ...

Diamond is the only gem made of a single element: It is typically about 99.95 percent carbon. The other 0.05 percent can include one or more trace elements, which are atoms that aren’t part of the ...

Richard T. Liddicoat Gemological Library. Search GIA's library catalog of 65,000 books, 230,000 images, 2200 videos, 1200 periodicals, and the renowned Cartier Rare Book Repository and Archive.

Amethyst, the February birthstone, is the purple variety of quartz. It is said to prevent drunkenness and make you quick witted in business. You once had to be rich to own this birthstone for February ...

Southeast Vietnam has a total area of 23,000 km 2, and approximately 10,000 km 2 is covered by basaltic formations with thicknesses ranging from a few meters to over a hundred meters (figure 2) (Hoang ...

Opal can range from 5 to 6.5 on the Mohs hardness scale. Hardness and toughness Gem and mineral hardness is measured on the Mohs scale. The numbers are based on the relative ease or difficulty with ...

Colored Stone Identification & Origin Report. An Identification Report, with geographic origin added. For polished, loose or mounted natural ruby, sapphire, emerald, Paraíba tourmaline, red spinel and ...

The premier online job board exclusively for the gem and jewelry industry. Free for job seekers and employers, you'll find powerful features to speed up your search for the perfect job or qualified ...

The 75.47-carat Hooker Emerald was worn by Ottoman Sultan Abdul Hamid II, the last sultan of the Ottoman Empire. Photo by Chip Clark, courtesy Smithsonian Institution, National Museum of Natural ...