Sapphire and diamond Harry Winston necklace in platinum, circa 1978 - part of the Spectacular Bid collection (estimate: $300-400,000).

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Sapphire and diamond Harry Winston necklace in platinum, circa 1978 - part of the Spectacular Bid collection (estimate: $300-400,000).

Sapphire and diamond Harry Winston necklace in platinum, circa 1978 - part of the Spectacular Bid collection (estimate: $300-400,000).