Emerald Cut Diamond & Sapphire Engagement Ring in PlatinumEmerald Cut Diamond Sapphire Engagement Ring in Platinum. This engagement ring features an emerald cut diamond in the center surrounded by a double halo of sapphires and diamonds. The gorgeous center diamond is of excellent quality and is accented by French cut sapphires that provide a beautiful contrast of color. An additional halo of diamonds encircles the outer edge while milgrain detailing adds additional texture.