A variety of retailers sell one-carat diamonds

A recent study indicates that a variety of retailers sell one-carat diamonds, but consumers pay vastly different prices at Costco versus Tiffany’s​‌‍‍‍‌‍‍‌‍‌‌‍‍‍‌‍‌‌‌‍​. The diamonds are a commodity; they must meet the same standards and are rated the same. Why would a consumer spend thousands more to buy a stone at Tiffany​‌‍‍‍‌‍‍‌‍‌‌‍‍‍‌‍‌‌‌‍​’s?

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