Aquamarine, garnet and diamond ring, a faceted octagonal aquamarine measuring 11.68 x 9.85 x 8.37 mm bordered by channel-set pave diamonds and green garnets, all mounted in 18k white gold, stamped 'AU750' '18ct', '6.24ct', 'D0.18ct', estimated diamond weight: 0.40ct ring weight: 6.0gm, aquamarine weight: 5.97gm, ring size: N.