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Costco's diamond engagement rings meet high standards. Costco uses the evaluation standards established by the Gemological Institute of America (GIA) to grade its diamonds. These standards ...
Brendan Smialowski/Bloomberg via Getty ImagesRings and bracelets are displayed for sale at a Costco store in Arlington, Va. By Nate Raymond NEW YORK -- Costco Wholesale Corp. (COST) willfully ...
On Thursday, Tiffany announced that it has filed suit in the U.S. District Court for the Southern District of New York against Costco Wholesale , alleging "trademark infringement, dilution ...
Diamond reports from GIA (as well as other, for-profit sources) are now demanded by most consumers purchasing diamonds over a certain size, typically for over 0.5 carat (100 mg), and almost always for over 1.0 carat (200 mg), and are considered an important tool in guaranteeing that a diamond is accurately represented to a potential buyer.
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IGI is the largest laboratory for certification of diamonds and fine jewelry. [8] IGI is International Organization for Standardization (ISO) 9001: 2000 certified in four countries, including the United States, Canada, India and the United Arab Emirates. [citation needed]