This opal ring has a Boulder Opal matrix set with anti tarnish sterling silver. The opal has emerald green and blue rivers of opal through the rich chocolate brown ironstone matrix. The colours dance across the surface of the opal on movement. Each piece of boulder opal matrix has its own unique picture. The opal measures 15mm x 15mm, the band tapers from 8mm wide beside the opal down to 5mm on the underside for comfort. The ring is a size 9.