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Há 2 dias · 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 4 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 · 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.
Há 5 dias · Amethyst Description. This amethyst crystal is from Namibia. It shows classic quartz crystal shape: a six-sided columnar crystal with a pyramid-shaped termination at the top. Courtesy Daniel Trinchillo, Fine Minerals International. Amethyst is the purple variety of the quartz mineral species.
Há 2 dias · Diamond Cut. Diamonds are renowned for their ability to transmit light and sparkle so intensely. We often think of a diamond's cut as shape (round, emerald, pear), but a diamond's cut grade is really about how well a diamond's facets interact with light. Precise artistry and workmanship are required to fashion a stone so its proportions ...
Há 4 dias · Top Gemological Laboratories. Here are some of the most respected gemological labs globally: Gemological Institute of America (GIA): Renowned for its rigorous grading standards. International Gemological Institute (IGI): Known for its comprehensive grading reports. American Gem Society (AGS): Offers precise cut grading and certification.
Há 5 dias · Due to their value and sensitive color grading, it’s important to buy colorful diamonds from a trustworthy jeweler. Your diamonds should come with a certificate of authenticity from the Gemological Institute of America (GIA) or the International Gemological Institute (IGI).
