Natural MATRIX BOULDER OPAL
Quantity: 1 piece.
Weight: 14.36 Carat.
Gem Type: Natural Opal.
Shape: Free Form Cabochon.
Size in millimeter: 15.8 Length. 14.0 Width. 9.3 Deep.
Color: Green-Purple-Blue Flashing.
Clarity: Opaque. Luster: Iridescent.
Origin: Australia.
Treatment: Unheated, Untreated.
Hardness: 5.0 to 6.5. Refractive Index: 1.45, the Mexican Opal might are valuable refractive low index arrive at 1.37 but, usual about 1.42 to 1.43, Opal is the gem refracts single , transparent gem will show ADR always.