4ct Princess Cut Black CZ Engagement Ring Trista's 4ct Sterling Silver Princess Cut Black CZ Engagement Ring makes a shiny & sophisticated addition to any fashionista's collection. The 925 sterling silver engagement ring features a gorgeous black 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.