From sparkling multi-million-dollar diamonds to custom designs, here are the most expensive diamond rings in the world that redefines luxury.

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

The One Cushion-Cut Diamond Micropavé Engagement ... ensuring that the fire and brilliance of each diamond stands out. The Belle Diamond Earstuds and the Belle Round Brilliant Diamond Micropavé ...