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'''Tiffany & Co.''' (colloquially known as '''Tiffany's''') is an American luxury jewelry and specialty design house headquartered on Fifth Avenue in Manhattan. Tiffany is known for its luxury goods, particularly its sterling silver and diamond jewelry. These goods are sold at Tiffany stores, online, and through corporate merchandising. Its name and branding are licensed to Coty for fragrances and to Luxottica for eyewear.

Tiffany & Co. was founded in 1837 by the jeweler Charles Lewis Tiffany and became famous in the early 20th century under the artistic direction of his son Louis Comfort Tiffany. In 2018, net sales totaled US$4.44 billion. As of 2023, Tiffany operated over 300 stores globally, in many countries including the United States, Japan, and Canada, as well as Europe, Latin America, and the collective Asia-Pacific region, and is exploring opportunities in Africa. The company's product line features fine jewelry, sterling silver, watches, porcelain, crystal, stationery, ''haute couture'' fragrance and personal accessories, and leather goods.

On January 7, 2021, French conglomerate LVMH Moët Hennessy Louis Vuitton acquired a majority stake in Tiffany & Co. for US$15.8 billion and delisted Tiffany's stock from the New York Stock Exchange. It remains headquartered in New York City.