Shop › Large Black Onyx and Faceted Jet Glass Sterling Necklace Image 1 of 3 Image 2 of 3 Image 3 of 3 Large Black Onyx and Faceted Jet Glass Sterling Necklace $172.00 Hallmark: 925Measures: 18 inches long, pendant is 2 inches long Add To Cart Added! Hallmark: 925Measures: 18 inches long, pendant is 2 inches long