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 Sale Price: $150.00 Original Price: $172.00 Purchased Hallmark: 925Measures: 18 inches long, pendant is 2 inches long Purchased Added! Hallmark: 925Measures: 18 inches long, pendant is 2 inches long