Shop › Emerald Cut Black Onyx and Marcasite Sterling Ring Sz 6.75 Image 1 of 3 Image 2 of 3 Image 3 of 3 Emerald Cut Black Onyx and Marcasite Sterling Ring Sz 6.75 $44.00 Purchased Size: 6.75Hallmark: none, tested as sterlingMeasures: 0.75 inch in height Purchased Added! Size: 6.75Hallmark: none, tested as sterlingMeasures: 0.75 inch in height