Antique Engagement Ring Art Deco GIA 2.46 Old Mine Cushion Cut Diamond in PlatinumThis original antique engagement ring features a stunning GIA certified 2. 46 carat cushion cut diamond. The bezel set center diamond shines on its own as a solitaire, however six (6) single cut diamonds adorn the shoulders of the ring and provide a hint of sparkle from every angle. Finished in platinum, this art deco engagement ring is a gorgeous example of the minimalist designs late in the period.