1.11 Mid-Century Diamond Engagement Ring in Platinum1. 11 Mid Century Diamond Engagement Ring in Platinum. This 1. 11ct Mid Century Diamond Engagement Ring in Platinum features a Round Brilliant cut center diamond with transitional cut accents. The accent diamonds form a blossoming petal shape, melding into rows of accent diamonds that line the shoulders of the ring. The profile view showcases the head of the ring and the fashionable details of platinum cradling the primary diamond. Created in the Mid