Give her the gift of forever. This stunning anniversary band features a row of five, certified round-cut diamonds (1/2 ct. t.w.) in 14k white gold. 1/2 Carat Diamond Anniversary Ring. Diamond Color Rating Code: E-F. Diamond Clarity Rating Code: I1-SI2. Diamond Cut: Round. Certified Diamond Ring. 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.