Koroit Boulder Opal Rough Chunk *Awesome Patterns/Rainbow Colors! Australia

Pricing & History
  • Sold for
    Start Free Trial or Sign In to see what it's worth.
  • Sold Date
  • Source eBay
TOP GRADE "AAA" PRE-1995 MINED KOROIT BOULDER OPAL ROUGH KOROIT BOULDER OPAL ROUGH (From Queensland, Australia) LENGTH: 55 MM WIDTH: 40 MM THICKNESS: 35 MM TOTAL WEIGHT: 580 Carats/116 Grams/4.1 Ounces PLEASE READ OUR NEW SHIPPING POLICY BELOW ABOUT KOROIT BOULDER OPAL The gemstone Opal is the official October birthstone as adopted by the American National Association of Jewelers in 1912. Boulder opal is found in Australia where precious opal forms in veins and patches within brown ironstone boulders. When the opal is mixed through the ironstones it is called matrix opal. Hardness ranges between 5.5 and 6 on the Moh’s scale. Boulder opal is very durable due to the ironstones the opal form in. Because content within the opal is very low it never cracks or crazes as it ages. Yowah & Koroit opal fields have the smaller boulder opals known as Yowah Nut Opals. The opals of Yowah and Koroit have a unique look, with stunning picture patterns of potch, opal and ironstone, not to mention the Yowah Koroit opal nuts with a beautiful crystal opal center. Boulder opal is second to none when you have the brilliant colors over the dark ironstone boulder. Brilliant reds, blues and greens dance and sparkle when moved. Boulder opal can be just as valuable and beautiful as a black opal from Lightning Ridge opal field. METAPHYSICAL PROPERTIES read more