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GOLD

A metallic element which is the most ductile and malleable of all metals, and impervious to corrosion, thus making it ideal for use in jewellery.  Pure gold is yellow in colour.  It is usually mixed with other metals, such as copper and silver, to create an alloy, such as white gold or rose gold.  The unit of measurement used to express the percentage of pure gold in the alloy is the carat, for example '18 carat gold'.