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Há 1 dia · 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 1 dia · Ruby is one variety of the corundum mineral species, which also includes sapphire. Ruby is highly regarded and can command high per-carat prices. It is arguably one of the most important gems in the colored stone market. In its purest form, the mineral corundum is colorless. Trace elements that become part of the mineral’s crystal structure ...
Há 3 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 3 dias · 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 green beryl colored by ...
20 de mai. de 2024 · The GIA Clarity Scale has 6 categories, some of which are divided for a total of 11 specific grades. Many inclusions and blemishes are too tiny to be seen by anyone other than a trained diamond grader. To the naked eye, a VS1 and an SI2 diamond may look exactly the same, but these diamonds are quite different in terms of overall quality.
Há 6 dias · The Gemological Institute of America (GIA) has released the Spring 2024 edition of Gems & Gemology (G&G), marking the 90 th anniversary of the journal. This issue presents research studies on coloured stones and treatments, recaps the Tucson gem shows, spotlights an impressive garnet necklace, and contains the annual G&G Challenge quiz.
Há 4 dias · About GIA Hong Kong. GIA upholds the highest standards of integrity, academics, science, and professionalism through education, research, laboratory services, and instrument development. Established in 1931, GIA is the world’s foremost authority on diamonds, colored stones and pearls. GIA Hong Kong leverages GIA's decades of groundbreaking ...
