If we're talking luxury, let's really talk luxury, because seriously, Costco sells diamonds! We're talking engagement rings, necklaces, earrings, and more. All of Costco's gems are GIA-certified, too.

Camillus, N.Y. — Walking into a Costco for the first time can be a bit overwhelming. There are pallets upon pallets of diapers, potato chips, tomato sauce and lots more. Costco's Syracuse-area store ...