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What is a Certificate?
Blue Nile Diamonds are Certified
Every loose diamond sold by Blue Nile has been analyzed and graded by either the Gemmological Institute of America (GIA) or the American Gem Society Laboratories (AGSL). These two laboratories are among the most respected laboratories in the diamond industry, and are known for their consistency and unbiased diamond grading systems. Diamonds that are accompanied by these grading reports are the most highly valued in the industry.
In addition to being graded by either the GIA or the AGSL, all Blue Nile Signature Collection diamonds are certified by GCAL. This additional certification provides a second independent and authoritative analysis of your diamond. GCAL also verifies that your diamond meets all of the demanding quality requirements of the Blue Nile Signature Collection diamonds.
View Certificates While Shopping
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 Portugal, 0800 206 1160 from the United Kingdom, or 00353 1 899 1351 for all other EU countries.
More About Cut
Blue Nile uses cut grades provided by GIA and AGSL whenever these are available. Many diamonds graded by the GIA prior to January 1st, 2006 do not have such grading. If a cut grade is not provided by one of these laboratories, Blue Nile defaults to a proportion system that uses measurements of depth and table to determine the amount of brilliance in a particular diamond’s cut. Learn more about how Blue Nile provides cut grades that allow you to compare diamonds using consistent criteria.