Black Opal Ring Field: Lightning Ridge (Australia)  Stone Size:  8x4 mm  Metal: 18k yellow gold     Finger Size:  U.S:  7  U.K:  N 1/2  Go here to find finger sizes  For different countries     Shipping: Free  Packaging:  Gem pouch  Guarantee:  International     References: testimonials   Questions?  contact us here  Member: American Opal Society.     Ring Varieties  There are multitudes of different types of finger rings.     Most well known are wedding bands, engagement, friendship, sc...