Diamond 相關
廣告精選鑽石、寶石、珍珠，來款訂造首飾，歡迎親臨半島酒店商場選購。 擁有20多年珠寶設計和製作的經驗，廣受香港及外國旅客歡迎，信譽良好，實力非凡。
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2020年4月20日 · Diamond color is all about what you can’t see. Diamonds are valued by how closely they approach colorlessness – the less color, the higher their value. (The exception to this is fancy color diamonds, such as pinks and blues, which lie outside this color range.) Most diamonds found in jewelry ...
2024年4月5日 · GIA is the world’s most trusted name in diamond grading and gem identification. With objectivity and expertise as its hallmarks, GIA ensures the integrity and accuracy of every report it issues. GIA tests every material submitted to determine whether it is natural or not, and discloses any ...
2019年2月1日 · Aside from simply knowing a diamond’s age for curiosity’s sake, diamond ages have proven to be extremely valuable tools for geologists studying the deep earth. Diamond ages have told us that diamonds are much, much older than kimberlites. They did not
2020年1月31日 · Methods and Challenges of Establishing the Geographic Origin of Diamonds. Evan M. Smith, Karen V. Smit, and Steven B. Shirey. Download PDF. Figure 1. A remarkable 404.2 ct type IIa rough diamond recovered at the Lulo mine in Angola in 2016. The main stone fashioned from it was a 163.4 ct D-color flawless emerald-cut diamond.
2022年2月13日 · An Introduction to Gem Treatments. Robert Weldon. As a consumer, you will regularly encounter in the marketplace gems that have been treated to change their appearance. A topic that often comes up is whether a particular gemstone is or isn’t treated. In a sense, humans alter all gem materials after they are found in the earth in order to ...
About Sapphire. Besides blue sapphire and ruby, the corundum family also includes so-called “fancy sapphires.”. They come in violet, green, yellow, orange, pink, purple, and intermediate hues. Some stones exhibit the phenomenon known as color change, most often going from blue in daylight or fluorescent lighting to purple under incandescent ...
ダイヤモンドは、地表から100マイルほどの深さでのみ生じうる高温高圧条件下で形成されます。. ダイヤモンドの炭素原子が基本的に全ての方向に同じ方法で結合しています。. もうひとつの鉱物、グラファイトも炭素のみでできていますが、その形成過程と ...
