Gold has been employed in jewellery for over seven thousand years! the wonder of pure gold is unmatchable. because the solely brass, its rich, deep yellow color and its substantial weight square measure universally appealing. Ancient individuals associated gold with the sun and gold has continually stood for wealth and power. Throughout the ages, most of the gold that has been mined has been accustomed build articles of knickknack and ornamentation. Even today, roughly fifty six p.c of the world’s output of gold is employed to create jewellery. Another thirteen p.c is consumed by natural philosophy, industrial, and dental uses, and thirty one p.c finally ends up as gold coins, bars, and alternative investments (World Gold Council 2009). Gold has typically
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been the quality on that folding money is predicated. Until 1939, the paper currency of the u. s. was backed by gold, that means that upon demand at a bank anyone may redeem gold for his or her paper currency. Gold is that the most malleable (i.e., “softest”) of all metals, which implies that it needs the smallest amount effort to bend and form.
It is conjointly the foremost ductile, creating it best of all metals to draw into a protracted wire while not breaking. In fact, one ounce of gold will be drawn into a fine thread many miles long. Pure, or fine, gold is exceptionally well-suited to chasing and shaping, however like pure silver and pure Pt, it’s usually thought-about too soft for jewellery because of its vulnerability to scratching, denting, and wear. Some Asian (mainly Chinese) jewellery is formed with pure gold, however within the West, pure gold is never employed in jewellery, except in CER tain cases. as an example, fine gold and fine silver square measure employed in enameling, and infrequently a edge is formed of pure metal to facilitate the setting of terribly fragile gemstones. most frequently although, pure gold is alloyed with copper and silver in variable proportions to supply the big selection of Karat gold alloys employed in jewellery (Illustration one.1). The proportions of those 3 metals verify the colour and dealing characteristics of the alloy.
Gold and alternative precious metals square measure weighed and listed internationally in troy ounces. during this ancient system, one apothecaries’ unit equals twenty troy unit (dwt), every of that con tains twenty four grains. within the system of weights and measures, one apothecaries’ unit equals thirty one.103 grams.