opal opal, known as Australia's "national stone", is one of the six internationally recognized precious gems. Derived from Latin opalus, it means "integrating the beauty of gems into one body" and is known as "the most beautiful gemstone" with diamonds. Opal is an amorphous gemstone deposit formed by depositing and solidifying gel like or liquid silica into formation fractures and caves, which also contains animal and plant residues, such as trees, shells and bones. The water content in the high grade 5 opal can be as high as 10% generally, the refractive index range of opal is 1. 38 to 1.60 and the Mohs hardness range is 5.5-6.5. The six internationally recognized gems are diamond, ruby, sapphire, emerald, emerald and opal. Among them, opal gems are more and more popular with people for their brilliant and changing colors. Due to the gradual depletion of resources, the value of opal gems has been very rapid in recent years.
opal
opal, known as Australia's "national stone", is one of the six internationally recognized precious gems. Derived from Latin opalus, it means "integrating the beauty of gems into one body" and is known as "the most beautiful gemstone" with diamonds. Opal is an amorphous gemstone deposit formed by depositing and solidifying gel like or liquid silica into formation fractures and caves, which also contains animal and plant residues, such as trees, shells and bones. The water content in the high grade 5 opal can be as high as 10%
generally, the refractive index range of opal is 1. 38 to 1.60 and the Mohs hardness range is 5.5-6.5. The six internationally recognized gems are diamond, ruby, sapphire, emerald, emerald and opal. Among them, opal gems are more and more popular with people for their brilliant and changing colors. Due to the gradual depletion of resources, the value of opal gems has been very rapid in recent years.