:: SUWA/Dictionary-Gemstones,Quality and Value::

Name of mineral : Opal
Mohs hardness : 5~ 6

Refractive index : 1.450
Specific gravity : 2.15

Weight: 2.78 ct
Size (mm) : L 13.3 x W 8.8 x D 3.61
Untreated
Gem Quality
US $14,000