Mexican girasol fire opal cutout border ring in 14K gold-fillThis handmade ring features a flashy Mexican girasol fire opal set in 14K gold fill with a cutout border. Gold fill provides a much thicker layer of gold than gold plated and should not wear off with proper care. Also known as rainbow opal and hyacinth opal, a girasol opal is an orangy reddish to yellow precious fire opal which shows its dormant colors when turned in the sunlight, or whose color appears to follow the sun as the stone is turned around.