Your choice between 9k and 18k solid white gold.
Solitaire ring: approx. 3mm wide band; 0.23ct man-made Charles & Colvard Forever One Moissanite (round brilliant cut; D-F colour, VS clarity) in a thick bezel setting.
Arch: approx. 2.5-3mm wide band; 2mm thickness; 0.01ct man-made Charles & Colvard Forever One Moissanites in flush setting.