Both sizes have great flash! Base Metal: Sterling Silver Platinum plating Stone: 3 Ethiopian Opals Untreated Stone Size: Appx 6x4mm Oval shaped stones Prong setting Tarnish-free and hypoallergenic metal crafting Sizes Available: 5.5 (8.5 SOLD) Brand new, no tags Gift boxes available upon request while supplies last. Please ask for availability. Reasonable offers considered. Over 300 rings in stock so listing little by little. If you're looking for a specific style, stone, or size, please inquire. #dainty natural gemstone neutral wedding engagement high quality romantic neutral iridescent rainbow flash