ALGT REPORT 91188333 Species ..................................................................................... Natural Opal Variety ....................................................................................... Crystal Opal Shape & Cutting Style ............................................... Pear, Mixed Cut Measurements ............................................ 23.85 x 12.75 x 5.54 mm Carat Weight ............................................................................. 7.11 Carat Color .................................................. White + Play of Colors (Intense) Transparency ......................................................................... Transparent Optical Effect ........................................................................ Opaliscence No indication of treatment. Chemical Composition .................................................... SiO2·nH2O Crystal System .................................................................. Amorphous Mohs Hardness ..................................................................... 5.0 – 6.0 Specific Gravity .................................................. 1.95 – 2.25 g/cm3 Optical Character ........................................... Isotropic, Aggregate Refractive Index ......................................................... 1.370 – 1.475