1 ct. Australian Boulder Opal

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Overview Specs Documentation This gorgeous Australian boulder opal changes colors right before your eyes. A beautiful array of colors can be seen at many different angles. A loose stone can be great for collectors, or to make a beautiful piece of jewelry! 1.0ct Boulder Opal Mined in Queensland, Australia 10.8mm x 6.3mm x 2.8mm BIRTHSTONES & ANNIVERSARIES 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 BIREFRINGENCE: None 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: [email protected] Show more