Owyhee Natural Blue Opal Plain Rondelles have a waxy luster, opaque translucency, very good polish, and symmetrical shape. Their color ranges from a light to medium saturation of slightly greyish denim blue, a platinum grey hue, and a crisp white hue creating a very soothing group of Blue Opals mined from one source near sacred Native American Grounds. AA grade for color, appearance, rarity.