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Every loose diamond sold by Blue Nile has been analyzed and graded by the Gemmological Institute of America (GIA). This laboratory is among the most respected in the diamond industry, and is known for consistency and unbiased diamond grading systems. Diamonds that are accompanied by GIA grading reports are the most highly valued in the industry.
In addition to being graded by the GIA, all Astor by Blue Nile™ diamonds are certified by GemEx - the leader in light measurement - for its brilliance, fire, and sparkle. This second independent analysis guarantees the Astor by Blue Nile™ diamond's uncommon brilliance.
If you are interested in a diamond and a certificate is not available for viewing on the site, simply contact a diamond and jewellery consultant at firstname.lastname@example.org or 00800-2583-6453 from Germany, 0800 098 8541 from the United Kingdom, or 00353 1 899 1351 for all other EU countries.