Owyhee Natural Blue Opal Plain Rounds have a waxy luster on these opaque beads, exhibit very good polish with a symmetrical shape with color ranges from a light to medium saturation on these slightly greyish denim blue hued opals showing areas of white hued opal, and these very soothing Blue Opals are a rare one source origin near sacred Native American Grounds. AA grade for color, appearance, rarity.