Platinum rings with sparkling sapphire center stones -Roberto Coin 22.81 carat Tanzanite and Diamond Ring in 18K White Gold

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Featuring a large marquise-cut, deep blue tanzanite with flashes of violet, surrounded by an intricate halo of diamonds in a floral motif, set in 18k white gold.
Signed RC for Roberto Coin with his iconic ruby. Accompanied by a Gubelin report stating that the tanzanite is natural.
The retail price in 2017 was $90,000.