The Cathedral Three Stone | CushionThree Stone Cushion Cut Cathedral Ring with Round Diamond Accents Quietly iconic. The Cathedral Three Stone gives a classic silhouette a modern refresh. A polished, tapered band rises to a sculpted basket, where two round side stones frame your cushion cut center diamond. With its low profile and clean lines, this three stone cathedral engagement ring stacks seamlessly with your wedding bandand will turn heads for years to come.