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Gold is one of the most precious metals in the world. It is present in the rivers, seas, and the earth's crust and trace amount are present in plants and animals. It is, however, difficult and expensive to extract. In modern mining operation, approximately 3 tons of ore are needed to extract one ounce of gold. The many desirable qualities found in gold along with its scarcity, have made it the most popular metal for use in jewelry today. Since ancient times the purity of gold has been defined by the term karat, which is 1/24 part of pure gold by weight. Pure gold is equivalent to 24K. Gold purity may also be described by its fineness, which is the amount of pure gold in parts per 1000. For example, a gold ring containing 583 fine gold has 583 parts (58.3%) gold and 417 parts (41.7%) of other base metals. |