Three Stone Emerald Cut Diamond Engagement Ring in PlatinumThree Stone Emerald Cut Diamond Engagement Ring in Platinum. This fine modern three stone engagement ring features a gorgeous 3. 02 carat emerald cut diamond and . 94 carats of emerald cut emeralds set in platinum. The ring also contains Asscher cut diamond accents along the shoulders below the main three stones, which is quite an unusual cut for an accent stone. The bezels around the center stones as well as on the borders of the channel set accents