Henri Daussi Certified Diamond Engagement Ring in Platinum. This treasure - a sensational certified halo-styled 2.96 ct. t.w. diamond engagement ring - sparkles! It showcases a certified cushion-cut center diamond of 1.66 carats in a halo of 1.30 ct. t.w. of diamond rounds which flicker along the band. >>Click on the Halo Diamond Ring to shop the Ross-Simons collection.