EXCLUSIVELY AT NEIMAN MARCUS Roberto Coin bangle from the ROCK & DIAMONDS Collection. Polished 18-karat white gold. Pyramid-stud trim with full pavé diamond center. 6. 85 total diamond carat weight. Roberto Coin signature hidden 0. 3-carat ruby. Hinged side eases dress. Approx. 2. 5"D; 1"H. Made in Italy.