Beautiful Double-Sided 78ct Natural Australian Solid Koroit Boulder Opal. 58.1mm x 23.0mm x 7.0mm thick. This double-sided natural Australian solid koroit boulder opal has beautiful colors of green, violet and turquoise. The colors are bright and fill the veins between the stone. The colors flash and streak vibrantly with rotation of the opal and interchange as they do.The first photo shows one side of the opal whilst the next photo shows the other side. There are touches of natural pitting on the surface of the opal. We pride ourselves in offering you boulder opal with bright gem colours. We go the extra mile to offer top quality opals in all price ranges. The item "Beautiful Double-Sided 78ct Natural Australian Solid Koroit Boulder Opal" is in sale since Tuesday, February 18, 2020. This item is in the category "Jewelry & Watches\Loose Diamonds & Gemstones\Loose Gemstones\Opal\Boulder Opals". The seller is "opals-downunder" and is located in Menai, NSW. This item can be shipped to North, South, or Latin America, all countries in Europe, China, Japan, Australia.