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Gold Assay It is critical from the public's perspective that there is confidence in the claimed purity of any particular item made from precious metals.This confidence is provided by an 'assay' (test and assess) of the precious metal content of that item.Gold is usually alloyed in jewellery to give it more strength, and the term carat describes the amount of gold present (24 carats is pure gold).It is estimated that all the gold in the world, so far refined, could be placed in a single cube 60 ft. It is metallic, with a yellow colour when in a mass, but when finely divided it may be black, ruby, or purple.It is the most malleable and ductile metal; 1 ounce (28 g) of gold can be beaten out to 300 square feet.
Gold is found in sea water, but no effective economic process has been designed (yet) to extract it from this source.
It also safeguards responsible manufacturers by providing an independent assessment of quality and content that in which the public has confidence.
There has been an "Assay Office" at Sheffield in England since 1773 when local silversmiths won the right from Parliament to assay silver in Sheffield.
White gold for jewellery is formed by mixing palladium, silver, or nickel with gold, although the result is green gold with certain proportions of silver.
White gold is commonly used for wedding rings in the USA.