NWT never worn. This circle pendant features black onyx, a unique variety of quartz found in nature. This striking pendant is traced with scintillating diamonds, resulting in a modern design with a smooth finish and high polish. As multifaceted as it is iconic, the Tiffany T collection is a tangible reminder of the connections we feel but can't always see. Showcase your personal style by pairing this pendant with other Tiffany designs for a bold look. 18k gold with black onyx and round brilliant diamonds Circle, 16 mm diameter Carat total weight .05 Adjustable 16-18" 18k gold chain