And diamond half hoop ring, 9 round brilliant cut diamonds, width 3 mm, size M 1/2, wt, 2.2g. An 18ct white gold half hoop diamond ring, 2.5 mm band set across the top with 9 round brilliant cut diamonds totalling approx. 0.63ct, Vs-Si, size M 1/2, wt, 2.2g.