Tiffany robin egg blue (Pantone 1837) was introduced by the company in their first catalogue in 1837. Since that time, Tiffany blue has been used in all branding, advertising, and packaging. The colour is produced as a private custom colour by Pantone, the number being the year of Tiffany's foundation. As a trademarked colour, it is not publicly available. Hex: #81D8D0 CMYK: 40, 0, 4, 15. Tiffany colour brand illustration by Zena O’Connor.