Nr 98973149

Opal - 7.11 ct - Antwerp Laboratory for Gemstone Testing (ALGT)
Nr 98973149

Opal - 7.11 ct - Antwerp Laboratory for Gemstone Testing (ALGT)
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
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