Your choice between 9k and 18k solid white gold.
Solitaire ring: approx. 3mm wide band; 0.25ct Sapphire in a thick bezel setting.
Arch: approx. 2.5-3mm wide band; 2mm thickness; 1.2mm Australian sapphire, blue sapphire, light blue sapphire, aquamarine sapphire, natural white diamond in flush setting.