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 ...

In recent months, sapphires treated under heat and pressure have been documented in the trade. This material is reported to be treated under pressure of 1 kbar at temperatures between 1200 and 1800°C ...

The Red Fort. Time Out London, the guidebook of good taste, stated this about Red Fort: “This upmarket restaurant has been showcasing the more refined aspects of North Indian food since the early ...

Figure 1. Pinctada maxima shells: gold-lipped (left) and silver-lipped (right). Their names are derived from the color of their nacreous shells. Photo by Nuttapol Kitdee. ABSTRACT. Non-bead cultured ...

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 ...

This reading list was compiled to give you an opportunity to learn more about the Cullinan Diamond. The list is not comprehensive, but a compilation of some interesting information that has often been ...

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 ...

2. Durability factors – Because they tend to be softer than or may not adhere well to the underlying gem, thin-film surface coatings of any kind are susceptible to scratching, particularly along facet ...

GIA will only assess polished diamonds for the GIA Diamond Origin program whose rough has been received in documented, sealed, untampered parcels from the mining companies. This process, coupled with ...

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, ...

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 ...

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 ...