Blue spinel bracelet with a fish scale motif and diamond ring/ Photo Credit：Carlton Davis

A ring set with a rare 3.03ct blue diamond/ Photo Credit：Carlton Davis

A diamond necklace that flows gently like water/ Photo Credit：Carlton Davis

Tiffany & Co. President Frederic Cumenal, actresses Reese Witherspoon, Olivia Wilde, Amber Heard, and design director Francesca Amfitheatrof (from left)/ Photo Credit：Benjamin Lozovsky/BFAnyc.com

(From left) Model Edie Campbell, fashion designer Jason Wu, model Dree Hemingway, and Constance Jablonski wearing jewelry from the Blue Book collection./ Photo Credit：Benjamin Lozovsky/BFAnyc.com

Francesca Amfitheatrof, design director at Tiffany & Co., and Angelica Zhang, editor-in-chief of Vogue China/ Photo Credit：Getty Images for Tiffany & Co.

Fashion designer Prabal Gurung and model Edie Campbell/ Photo Credit：Getty Images for Tiffany & Co.