Kay Jewelers Men's Diamond Band 3/8 ct tw Round-Cut 14K White Gold- Men's Bands: Intense round-cut black diamonds stacked between pyramids of 14K white gold define this powerful band for him. The total diamond weight is 3/8 carat. A square hematite on the inside of the 5.5mm band completes the look. Black Diamonds are treated to permanently create the intense black color. From the Neil Lane Men’s Collection.