Make the proposal even more perfect with this engagement ring from X3. Crafted from 18k white gold, round-cut pave diamonds (1-1/4 ct. t.w.) add the perfect sparkling touch. 1-1/4 Carat Diamond Ring. Diamond Color Rating Code: H. Diamond Clarity Rating Code: I1. Diamond Cut: Round. Certificate of Assurance included. Almost all gemstones and blue and black diamonds have been treated to enhance their beauty and require special care. All gemstone carat weights (ct. t.w.), if mentioned, are approximate; variance may be .05 carat. Ring Sizer.