As of February 2025, the Costco website lists rings starting at $599.97 for a double-row band in 14k white gold with a 0.70-carat VS2 diamond. The priciest offering at this writing is a $319,999. ...

The Emerald Cut & Round Brilliant VS2 Clarity, G Color Diamond Platinum Eternity Band at Costco is stunning — not just from the look, but also the amount you’ll pay for full carat weight for ...