Mid-Century Onyx & Diamond Ring in PlatinumMid Century Onyx Diamond Ring in Platinum. This Mid Century onyx cocktail ring features a . 72 carat round brilliant cut diamond set in platinum atop a piece of smooth black onyx. The black onyx and diamond look has been around for a long time, probably because it looks so great! This ring has such a unique design because of the smooth curved shape of the onyx. A rare find and one that you will love!
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