This opal ring has an eye catching solid Boulder Opal matrix set with anti tarnish sterling silver. The opal has the unique organic pattern found in Koroit matrix with green , red and vanilla opal sparkling from the rich brown matrix. Each piece of boulder opal matrix has its own unique picture. The freeform shaped opal has a naturally curved surface and measures 33mm x 17mm, the band tapers from 10mm wide beside the opal down to 6mm on the underside for comfort. The ring is a size 10.