Cathedral Halo Round Diamond Engagement Ring TR737The TR737 is Simon G. at its most architectural. A cathedral mounting in 18k white gold with a scalloped diamond halo, arched shoulders and a graduated pav diamond shank set with G H, VS accent stones totaling up to 0. 43 carats. The elevated profile gives a round brilliant center stone real prominence. Something you put on for a celebration and never quite stop wearing.