I get asked this question SO much so here it is... Tiffany Blue is a specific shade of light blue, quite like "duck egg blue". Tiffany Blue is a trademarked color of Tiffany & Co., and is PMS 1837 on the Pantone Matching System (PMS) and this is also the year Tiffany & Co. was founded. Tiffany Blue is so strongly linked with Tiffany & Co. that their trademarked “little blue box” is instantly recognized across the globe. Hint hint...
Because Tiffany Blue is trademarked, it cannot be used to package or advertise anything that might be associated with or in direct competition with Tiffany & Co. or its subsidiaries or be used to cause confusion amongst consumers.