A long time ago, between 145 and 66 million years ago when dinosaurs still walked the earth, Opals were formed - beneath the Red dust of the Australian Outback, Mother Nature’s beautiful and mysterious gift. Australia's National Gemstone, and the October Birthstone.
Opals can form in every colour of the visible spectrum - depending on the environmental conditions during formation. The minerology of the opal cause s an optical phenomenon 'Play of Colour', causing it to shimmer and diffract light in dazzling colors! They can display intricate and unique patterns which appear to gradually change colour as the angle of view, or angle of illumination changes.
Just like fingerprints every opal is distinctly individual -each one as unique as the person who wears it! Evaluating Opal is a highly refined art, as it is a difficult gemstone to value with many variable factors influencing price.
The main points of consideration according to the Gemmological Institute of America (Creator of the 4Cs of Diamond Valuation - Cut/ Colour / Carat / Clarity)
Colour - Background Colour, Body Tone, Brilliance
Pattern - The play of color / arrangement
Clarity - Transparency / Inclusions
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