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Há 3 dias · 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 5 dias · Diamond Color. The color evaluation of most gem-quality diamonds is based on the absence of color. A chemically pure and structurally perfect diamond has no hue, like a drop of pure water, and consequently, a higher value. GIA's D-to-Z color-grading system measures the degree of colorlessness by comparing a stone under controlled lighting and ...
Há 4 dias · Peridot Description. While the 64.57-carat cut peridot is magnificent, it is overshadowed by the amazing. 7.9-cm tall crystal. Both are from Sappat, Kohistan, Pakistan. - Jeffrey Scovil. Gem miners find peridot as irregular nodules (rounded rocks with peridot crystals inside) in some lava flows in the United States, China, and Vietnam and, very ...
Há 5 dias · Photo by Eric Welch/GIA. Emerald is the green to bluish green variety of beryl, a mineral species that also includes aquamarine as well as beryls in other colors. Gem experts differ on the degree of green that makes one stone an emerald and another stone a less-expensive green beryl. Some people in the trade tend to give the name emerald to any ...
Há 3 dias · 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 3 dias · 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 diamond mined from the Victor mine in Canada.
Há 1 dia · Diamonds exhibit a range of colors, often graded by the GIA (Gemological Institute of America) scale from D (colorless) to Z (light yellow or brown). Fancy color diamonds, such as blue, pink, and green, are much rarer and highly valued.
