Blolder opal11 52ct - YouTube. Boulder Opal Australian Natural Gemstone 11.52ct Cabochon. Opal 100% natural earth mined opal gemstone. 20.4mm X 12.8mm X 5.4mm thick.This opal has been hand cut and polished by me. The opal is ready to be set in to jewelry, drilled or wire wrapped, lovely gemstone. I Usually Dispatch orders out within 24 hours. All photos are taken by me and under a normal lights and show off the opals best colors. Please do not hesitate to contact me if you have any questions. The item "Boulder Opal Australian Natural Gemstone 11.52ct Cabochon SEE VIDEO" is in sale since Thursday, October 22, 2020. This item is in the category "Jewellery & Watches\Loose Diamonds & Gemstones\Loose Gemstones\Opal\Boulder Opals".crazy" and is located in Brisbane. This item can be shipped to Australia, North, South, or Latin America, all countries in Europe, all countries in continental Asia, New Zealand.