This opal ring has a wood replacement Boulder Opal matrix opal set with anti tarnish sterling silver. The opal has sparkling green tones from the beautifully patterned natural chocolate brown matrix ironstone. Each piece of boulder opal matrix has its own unique picture. The opal measures 23mm x 14mm and is set with the highly polished (anti tarnish) sterling silver formed wrapping up around the opal. The band tapers from 15mm wide beside the opal down to 5mm on the underside for comfort. The ring is a size 13.