The historic piece, which was owned by the highest ranking of aristocracy and worn during at least two royal coronations, is part of auction chain Sotheby's 'Royal and Noble' sale in Geneva this November.
Rare 300-carat diamond necklace with links to Marie Antoinette fetches €4.5m in Geneva auction
Composed of approximately 300 carats of old mine-cut diamonds, the historic piece was once worn during royal coronations and is..
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