.65 ct. Australian Black Opal

  • This gorgeous Australian black opal changes colors right before your eyes. A loose stone can be great for collectors, or to make a beautiful piece of jewelry!

    1. 0.65ct Black opal
    2. Mined in Lightning Ridge, Australia
    3. 7.4mm x 4.5mm x 2.7mm


    Opal is an October birthstone and the 14 year wedding anniversary stone.

      MINERAL: Hydrated Silica
      CHEMISTRY: SiO2•nH2O
      COLOR: All colors
      REFRACTIVE INDEX: 1.37-1.47
      SPECIFIC GRAVITY: 2.15 (+0.08, -0.90)
      MOHS HARDNESS: 5 to 6.5
  • If you need additional information regarding any of our gems or stones please contact us at: shop@rockshopjewelry.com