Amerie's 2.5 Carat Cushion Cut Halo Engagement Ring Look simply elegant with this Cushion Cut Engagement Ring. This CZ ring is sterling Silver Tone and lead free. Cushion cut CZs are 2.5 carats, while round cut CZs are 0.014 carats. Add trendy vintage look with this one-of-a-kind Silver Tone ring! Simulated Marble Dome Cocktail Ring Weights 4.9 grams.