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Há 1 dia · The Gemological Institute of America (GIA) invites all interested people to explore the fascinating world of gemology at the upcoming Couture and JCK Las Vegas shows.Attendees in Las Vegas will have the opportunity to dive deep into GIA's offerings through interactive displays, educational presentations, hands-on demonstrations, and the GIA Show Service Laboratory.
Há 6 dias · Amethyst is the purple variety of the quartz mineral species. It’s the gem that’s most commonly associated with the color purple, even though there are other purple gems such as sapphire and tanzanite. Its purple color can be cool and bluish, or a reddish purple that’s sometimes referred to as “raspberry.”. Most people think of ...
Há 4 dias · 培育钻石的权威证书通常由一些著名的 gemological 实验室或机构颁发，这些实验室拥有国际认可和声誉。. 其中一些知名的权威证书包括： 1、GIA（Gemological Institute of America）： GIA 是全球最知名的 gemological 实验室之一，其评估和认证被广泛认可。. GIA 的证书提供了 ...
Há 6 dias · Alexandrite Description. This 7.19-carat alexandrite was cut to feature its beautiful color change. When the light source changes from daylight to incandescent light, the gem’s color changes from bluish green to reddish purple. Alexandrite, with its chameleon-like qualities, is a rare variety of the mineral chrysoberyl.
Há 3 dias · In October 2018, a diamond weighing a remarkable 552.7 ct was recovered from the Diavik mine in Canada. This is by far the largest known gem diamond found to date in North America. It is nearly three times larger than the 187.63 ct Diavik Foxfire which was unearthed from the same mine in August 2015, and about twice the size of a 271 ct white ...
2 de jul. de 2023 · Topaz Description. This selection of gems from Ouro Prêto, Brazil, and Russia's Ural Mountains, displays the golden orange to pinkish red color range of precious topaz. The gems range from 7.61 to 14.33 carats in size. Many consumers know topaz as simply an inexpensive blue gem.
Há 1 dia · Nigerian sapphires are typically dark blue, although goods found in the southeastern part of the country tend to be lighter in color. Parti-colored, yellow, purplish, and green sapphires are also common. Figure 2. This necklace makes use of the Arewa knot, a symbol of unity. Photo by Kevin Schumacher.
