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19 de mai. de 2024 · About GIA A Tradition Of Science and Education. Established in 1931, the Gemological Institute of America (GIA) is the world’s foremost authority on diamonds, colored stones, and pearls. A public benefit, nonprofit institute, GIA is the leading source of knowledge, standards, and education in gems and jewelry.
Há 21 horas · ダイヤモンドのカラット重量. ダイヤモンドのカラット重量とは、ダイヤモンドの重さの測定です。. 基準の「カラット」は200ミリグラムと定義されています。. 1カラットは100「ポイント」に分割することができます。. これにより、小数点以下百桁まで非常 ...
Há 5 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 ...
Há 5 dias · Topaz is allochromatic, which means that its color is caused by impurity elements or defects in its crystal structure rather than by an element of its basic chemical composition. The element chromium causes natural pink, red, and violet-to-purple colors in topaz. Imperfections at the atomic level in topaz crystal structure can cause yellow ...
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Há 2 dias · Peridot History and Lore. This 146.10-carat peridot is in the collection of the Natural History Museum in London. Peridot has always been associated with light. In fact, the Egyptians called it the “gem of the sun.”. Some believed that it protected its owner from “terrors of the night,” especially when it was set in gold.
Há 1 dia · Moonstone’s mysterious, billowy, glow has fascinated people for centuries. According to Hindu mythology, moonstone is made of solidified moonbeams. Many other cultures also associate this gem with moonlight, and it’s easy to see why. Its internal structure scatters the light that strikes it, creating a phenomenon known as adularescence.
