Antique Engagement Ring Art Deco 1.10 Round Cut Sapphire in PlatinumThis original antique art deco engagement ring features a solitary 1. 10 carat round cut sapphire. The center stone is held in place by eight prongs in a hexagonal basket decorated by filigree open work on four sides. Engraving runs the halfway down the ring shank and adds a gorgeous touch of unique detail. A beautiful antique engagement ring for somebody looking for an alternative to diamonds.