18 Karat Tri-Gold Diamond Ring. 0.29 Carat Total Diamond Weight. Crafted in a harmonious trio of 18kt gold tones, this striking ring blends yellow, rose, and white gold in a contemporary layered design. A 0.29ct circle of shimmering diamonds anchors the piece at its centre, adding brilliance to its bold form. The ring measures 10.50mm in width, 21.04mm in outer diameter, and 1.80mm in thickness.