This October birthstone often has a white background buy displays a lot of colors in bright light
[DOC] [TLE] Opal Buying Guide | eBay [PAR] Found in necklaces, bracelets, rings, as loose stones, and more, opal has been 
cherished for ... As the October birthstone and the traditional wedding gift for the 
14th ... which often display a light grey background; these two are equally as rare.