Cartier Diamond Ring Contessa 18k Gold Engagement RingA Cartier diamond ring from the Contessa collection, made of 18k white and yellow gold. Round diamonds are set at even intervals around the ring, with each stone siting within a geometric section. Polished white gold frames each diamond station, and this mix of metals highlights the sparkle of the stones and adds depth to the design. This Cartier diamond ring works beautifully as a wedding band or as a refined 18k gold engagement ring for someone who