The emerald cut is the most graphic shape in gemstone design: its rectangular step-cut facets create a hall-of-mirrors effect that is architecturally distinct from the sparkle of round brilliants. In natural black onyx, that geometry becomes even more deliberate - the steps reflect as deep, absorbing planes rather than bright facets, producing a ring that reads as modern and considered. At 10 by 8 millimeters, the stone commands genuine scale in a rhodium over sterling silver setting that keeps the frame clean around the darkness of the stone. Non-sizeable, so measure carefully before ordering. Black onyx at this quality and cut is real fine jewelry for the customer who prefers depth over glitter and architecture over ornament.