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https://www.costco.com/jewelry-buying-guide-diamonds.html
When purchasing diamond jewelry from Costco, you can be assured you will receive quality jewelry at an unparalleled value. We guarantee that all diamonds supplied by Costco Wholesale have a clarity to be "VS2" or better and color to be "I" or better as outlined by the industry standard in the Gemological Institute of America (GIA) grading guide.
https://www.costco.com/rings.html?stone-type=diamond&refine=
https://www.costco.com/costco-diamond-jewelry-faqs.html
Costco and our suppliers support the Kimberley Process, a multinational initiative to stem the flow of conflict diamonds, and the World Diamond Council’s System of Warranties, a voluntary system of industry self-regulation that assures buyers of diamond jewelry that the diamonds in the jewelry they have purchased are from legitimate sources and conflict free.
https://www.costco.com/diamond-jewelry-information.html
The Gemological Institute of America (GIA) is the world's foremost authority on diamond and gemstones. GIA has established the internationally accepted standard for diamond grading on which Costco's standards are based. Costco offers our members high quality jewelry at an exceptional value.
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