Once dismissed as ugly ducklings, flawed and unusual stones are increasingly being championed by high-end jewelers.

Jewelry’s rising value is now outpacing ... can command roughly 10 times more than a light-blue stone of the same size, according to the Fancy Color Research Foundation, whose recent figures ...

High-end jewelry brand U-Treasure ... and Jean Kirstein -- are each represented by a singular stone in a signature ruby red, sapphire blue, lighter sky blue, forest green and lighter peridot ...

Sotheby’s next jewelry auction wants to help you enter your blue period.