Sterling Silver Oak Leaf Ring set with Bright Australian Opal Adjustable

Vintage cast sterling silver ring that has stars and oak leaves that wrap around the bezel. it is set with a solid Australian opal. The stone has a natural mosaic pattern to the play of color. The color has natural striations in some areas. It is like looking at a kaleidoscope, The flash has every color of the rainbow and the colors are bright. It has a split shank and right now it is a size 6.5. It is adjustable, but I would have a jeweler do it as to not stress and crack the stone. 

Ring is 18mm wide. Weight: 8.5 grams.