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 ...

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 ...

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 ...

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 ...

The 330-ct Star of Asia is in the collection of the National Museum of Natural History – Chip Clark, courtesy Smithsonian Institution Traditionally, sapphire symbolizes nobility, truth, sincerity, and ...

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 ...

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 ...

Close-up view of a large polished slab of quartz variety tiger’s-eye from the Marra Mamba Iron Formation of Western Australia. It measures more than 3 meters (10 feet) long, 50 cm (20 inches) wide and ...

GIAの2つの画期的な新製品のデビューを見逃さないでください。 GIA ダイヤモンド オリジン レポート: 科学に基づくトレーサビリティ 消費者は、これまで以上に持続可能かつ倫理的に調達された製品に対する意識を高めてい ...

This 5.30-carat emerald from Brazil has a slightly bluish green color. Courtesy John Parrish, courtesy African, Brazilian, Colombian Gems Incorporated. Emerald has many special qualities, but colored ...

Aquamarine and heliodor are colored by Fe ions, an important coloring agent for beryl. Blue to yellow gem beryl was studied by quantitative spectroscopy and trace-element analytical techniques to ...