This 4.5 out of 5 bright solid Australian black opal stone measures 40.60mm X 37.60mm X 10.10mm thick. 86 carats SOLID LIGHTNING RIDGE BLACK OPAL m12700b - YouTube. We can accept credit cards and electronic transfers through.International Buyers - Please Note. Our reputation is paramount, without it we would not have been in business and the opal industry since 1967. We treat our customers with the respect we would like them to treat us with. The item "86ctw RARE DBLE SIDED SOLID AUSTRALIAN LIGHTNING RIDGE BLACK OPAL STONE 12700" is in sale since Friday, April 4, 2014. This item is in the category "Jewelry & Watches\Loose Diamonds & Gemstones\Loose Gemstones\Opal\Black Opals". The seller is "$1-australian-opals" and is located in Nerang, QLD. This item can be shipped worldwide.