Enya's 1.5ct Silvertone Black CZ Engagement Ring Enya's 1.5ct Sterling Silver Simulated Round Black Diamond Engagement Ring makes a sleek & sophisticated addition to any fashionista's collection. The 925 sterling silver engagement ring features a gorgeous Simulated black diamond round cut CZ measuring 1.5-carats. Wear it as an everyday ring or use this unique piece as your engagement ring.