Natural Solid 64.49 Carat.. Kite Shape Queensland Boulder Opal..Please view Photos for more details. Size in MM: 36 x 28 x 10. Condition: It has traces of Clay in it. The item "Very Big 36X28 MM Natural Solid 64.49 Ct. Queensland Boulder Opal" is in sale since Sunday, November 25, 2018. This item is in the category "Jewellery & Watches\Loose Diamonds & Gemstones\Loose Gemstones\Opal\Boulder Opals". The seller is "seldomart" and is located in North Parramatta, NSW. This item can be shipped worldwide.