Emerald Cut Diamond w/ Sapphire Engagement Ring in PlatinumEmerald Cut Diamond w Sapphire Engagement Ring in Platinum. This amazing engagement ring features a . 71 carat emerald cut diamond wrapped in a neat sapphire halo and is finished in platinum. The sapphires of the halo are calibre cut to the diamond shape and channel set among fine milgrain detail. There is also a thin line of accent diamonds along the shoulders below the primary stone.