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Tiffany & Co. Heart Earrings, Rubedo Metal, Please Return to Tiffany and Co., New York, Like New, 10mm X 10mm, 2.2 Grams, Tiffany Blue Bag. Friction Posts. Hallmark: T & Co. Metal, Authentic. These earrings are in like new condition. Their a beautiful pink color made of a metal called Rubedo, created by Tiffany and Co. to celebrate their 175th anniversary. The metal is comprised of gold, copper, and other metals. These earrings are retire, limited and highly collectible. Please let us know if you have any questions.