Your choice between 9k and 18k solid white gold.
Solitaire ring: approx. 2mm wide band; 0.25ct Sapphire in a thick bezel setting.
Wave arch: approx. 2.5mm wide band; 1.5mm thickness; 1.2mm Australian sapphire, blue sapphire, light blue sapphire, aquamarine sapphire, natural white diamond in flush setting.