Mid-Century 1 Carat Diamond Engagement Ring PlatinumMid Century 1 Carat Diamond Engagement Ring Platinum. This exquisite mid century . 98 carat diamond engagement ring features clean and neat metal work around the center stone and open spaces allowing light into each diamond. The ring has a high profile, allowing more of the sides of each stone to be seen. Finished in platinum, this mid century ring is a beautiful find and example of the time period.