Artemis Crown Ring with Black SpinelBlack spinel is a fantastic alternative to black diamonds, as they are a highly reflective and durable stone. The curved design of this ring is ideal for stacking with other rings and as a unique wedding band. 3. 5mm, 2. 5mm and 2mm round faceted black spinel stones band is round and measures 1. 5mm wide opening accommodates another ring with a stone up to 8mm wide available in sterling silver or solid 14k yellow, white or rose gold made to order,