Marina B’s Crisila pendant necklace is a tour-de-force of technique, design and materials. A Moroccan-style quatrefoil pendant centers on two pear-shaped amethysts and rubellites edged in diamonds. This principal design element is surrounded by a frame that cleverly reverses from black to white mother of pearl. The opulence continues on the 18k yellow gold chain that features stations of amethyst, pink sapphire and diamond pave.