Dainty Blue Opal Oval Ring Beautiful Light Weight Blue Opal Ring. This Dainty Blue Opal Ring has a Pretty Engraved Etched Edging. The edging is set around a Vibrant Blue Opal. The setting is approximately 12mm x 10mm & the Blue Opal inset is 10mm x 8mm . It comes in sizes: Small (Size 6 / L/M) Medium (Size 7 / N/O) Large (Size 8 / P/Q) & X Large (9 / R/S) & is a lovely Lighter Weight Design.