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Gemstone Information

Chrysoprase

Chrysoprase, the most valuable variety of crypto/microcrystalline quartz (chalcedony), is composed chemically almost entirely of silicon dioxide.

Opal

Australia has three main types of natural precious opal, its national gemstone. Varieties are defined by body tone and transparency.

Sapphire 

Sapphire, a variety of the mineral corundum, is one of Queensland's most important gemstones.

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Last Updated 19 October 2007