Birthday girl Princess Isabella was the belle of the ball in a glittering navy tulle gown with silver embroidery on the back.

Bonhams’s upcoming live sale, Paris Jewels, in Cornette de Saint Cyr will feature a single-owner collection of Chaumet jewels.

Cosmic Splendor,’ on view in NYC, features dazzling pieces from the brand's Sous les Étoiles high jewelry collection.