Word Originearly 17th century: from Old French tifanie, via ecclesiastical Latin from Greek theophaneia ‘epiphany’. The word is usually taken to be short for Epiphany silk or muslin, i.e., that worn on Twelfth Night, but may be a humorous allusion to epiphany in the sense ‘manifestation’ (because tiffany is semi-transparent).
Tiffany & Co. 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. Wikipedia