Tiffany Blue is the colloquial name for the blue color associated with Tiffany & Co., the New York City jewelry company.
The Tiffany Blue color is protected as a color trademark by Tiffany & Co. in some jurisdictions including the U.S.
The color is produced as a private custom color by Pantone, with PMS number 1837, the number deriving from the year of Tiffany’s foundation. As a trademarked color, it is not publicly available and is not printed in the Pantone Matching System swatch books. (from: wikipedia)

I cannot believe that there’s someone can stop herself loving the Tiffany Blue Box® Pendant. The turquoise pendant is decorated with round brilliant diamonds in platinum.

This is another tiffany blue box charm, with enamel finish in sterling silver. Although it is made of sterling silver, no less brilliant than the diamond one. And I love this one better.