This antique Art Deco moonstone ring is stunning! We always love a moonstone with a blue flash. The rarest and most expensive moonstones will be colorless with a floating blue color or schiller that seems to hover above the stone. This phenomenon is termed adularescence and is due to a combination of orthoclase and albite feldspars, arranged in layers. Light reflected from these layers produces interference effects and causes the adularescence. This oval moonstone cabochon is surrounded by a halo of diamonds and hand dotted milgrain, all set in platinum. This ring would make the perfect statement piece for everyday wear, and would be an amazing addition to any jewelry collection.