This listing is for a Queensland mined natural Australian solid boulder opal cabochon. All boulders are wonderful slices of the geological record that happen to be gorgeous to design with and equally awesome to enjoy as specimens. A maelstrom of galactic Opalic swirls. Flash in abundance - you will love it !! ***** Size - 16 x 9 x 3.5 mm Carat weight - 5cts ***** All items are posted with insurance and tracking for peace of mind. This is a flat rate so add as many items as you like! https://www.etsy.com/shop/oblivionjewellery/policy?ref=shopinfo_policies_leftnav Happy shopping!