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Category Archives: October

Opal – The Birthstone for October

Opal is a hardened silica gel, it usually contains water and unlike most gemstones it is non-crystalline. There are two varieties: precious opal, which shows flashes of colour depending on the angle of viewing and common or “potch” opal which is often opaque and does not display colour. The word opal has origins in the Latin word “opalus” meaning stone … Continue reading

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