A One-of-a-kind marquis shaped rainbow moonstone with a stunning blue fire set in a sterling silver serrated bezel with a sterling silver split shank double band. 
This ring is size 7
The stone measures 24.3mm X 11.9mm 
The band is 4.1mm
*With double bands, the width of the band is thicker (4.1 mm) so you should take the width into account when selecting a size and size up a 1/2 a size.