
To check the purity of gold in the jewellery the standard unit that is used is K or Karat system. Jewellery which is made up of pure gold is of 24K where as jewellery of 18K contains 18 parts of gold and 6 parts of another metal or metals.
Gold which is of white color (i.e. white gold) is a mixture of nickel or palladium with gold. Copper is added with gold to make it of pink color (i.e. rose gold) and silver is added with gold to make it green gold.
Making alloys changes the color of the metal and make the metal damaged and useless, and the main goal of the jeweler is to produce the metal which is durable and attractive.
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