Show her the depth of your love with this stunning bridal ring by Sirena. Crafted in 14k white gold, it features a unique bypass design that cradles a full-cut diamond (1/5 ct. t.w.). 1/5 Carat Diamond Ring. Diamond Color Rating Code: J-K. Diamond Clarity Rating Code: I1. Diamond Cut: Full. 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.