Trista's 4ct Princess Cut CZ Black Rhodium Plated Engagement Ring The black rhodium electroplating will eventually wear off and need to be re-plated. We offer a 30 day Guarantee, No Questions Asked. You may get a replacement or a refund by simply contacting customer service. The 925 sterling silver, black rhodium plated engagement ring features a gorgeous princess cut CZ measuring 4.12-carats. In addition to the bold black CZ, the ring features small clear CZs that extend partially down the band on each end. Wear it as an everyday ring or use this unique piece as your engagement ring.