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 ...

Gem News International Gems & Gemology, Spring 2025, Vol. 61, No. 1 Green Jadeite-Omphacite from Guatemala. Jennifer Stone-Sundberg, Aaron Palke, and Wim Vertriest ...

GIA scholarship application cycle is from April 15 to May 15, 2023. To apply, click the button below to learn more. GIA-administered scholarships are available for GIA campuses worldwide. • Applicants ...

这张卡拉拉大理石采石场的插图刊登在 1880 年的 La Science Populaire（《科学画报》）杂志上（5 月 27 日，第 1 卷，第 15 期，第 232-233 页）。

橄榄石产自哪里？ 八月生日石橄榄石有一个非常奇妙的故事。虽然如今珠宝中看到的大部分橄榄石都产自中国、缅甸、巴基斯坦、坦桑尼亚、越南和美国等产地，但有些橄榄石是伴随陨石来到地球的，而其他则产自异域风情的地区，如夏威夷的橄榄石海滩，那里的沙子闪烁着亮绿色的光芒。

Diamond Origin Report. Full 4Cs assessment with a plotted clarity diagram, geographic origin and GIA report number laser inscription. For loose, natural D-to-Z color diamonds only, weighing 0.15 ...

摄影：亨利‧莫桑（Henri Moissan）自行建造在实验中使用的的电弧炉，尝试在高温高压条件下合成钻石。照片来源：谷哥图片（Google Images） 钻石拥有多种独特的物理特性，比如硬度、亮光和光学透明度，两千多年来一直备受推崇 ...

在正常颜色范围内，钻石是无色至浅黄色。 而另一方面，彩色钻石则呈现不同颜色，有黄色和褐色钻石。

在今天的珠宝市场上，购买宝石级合成钻石或实验室制造钻石比以往容易多了。这让人们在对实验室制造钻石产生浓厚兴趣的同时，也让大家产生了顾虑：宝石学家或宝石学鉴定所能否鉴定这类钻石？ 过去 30 年间，GIA 对实验室 ...

Figure 1. “Healing Sisters” rings with Four Peaks amethyst and San Carlos peridot, both from the San Carlos Apache Reservation in Arizona. These stones represent the geological diversity of colored ...

Feature Gems & Gemology, Summer 2020, Vol. 56, No. 2 Optical Whitening and Brightening of Pearls: A Fluorescence Spectroscopy Study. Chunhui Zhou, Tsung-Han Tsai, Nicholas Sturman, Nanthaporn ...

Annotated reading lists compiled on Carrara marble. This illustration of a Carrara marble quarry appeared in the journal La Science Populaire in 1880 (Vol 1, No. 15 (27 May), pp. 232-233).