12 x 7 Lightning Ridge.. With Nice Green and Blue Fire. 12x7 Lightning Ridge 1.61 Ct. Solid Black Crystal Opal" is in sale since Thursday, January 3, 2019. This item is in the category "Jewellery & Watches\Loose Diamonds & Gemstones\Loose Gemstones\Opal\Black Opals".The seller is "seldomart" and is located in North Parramatta, NSW. This item can be shipped worldwide.