Half Sizes.... Half Sizes of Opal Rings.. Australian Blue Opal Ring, Opal (Doublet) Ring, Ocean Blue Opal 1.5 Ct, Sterling Silver Ring, Deep Blue Opal Ring, Best Opal Ring Australian Blue Opal Ring (Doublet) 1.5 Cts. Sterling Silver Ring Half Sizes Very Well Made Sterling Silver Setting Natural Australian (Doublet) Opal 1.5 CT Great Blue Glow Nice Consistent Color Even Tones in this Australian Opal Fine Natural Opal with Great Deep Color Beautiful Natural Blues do have some Green...