Gold and silver have been known to people for several millennia. Archeologists found a huge number of gold and silver products. Gold and silver do not oxidize in the air. Time has no power over them. Due to these features these metals have been highly valued at all times. Platinum became known much later than gold and silver. Platinum became known only in the 16th century. Platinum nuggets were found together with gold nuggets. In the beginning, people did not pay attention to platinum and even threw it away because of its low value. For a long time, people could not process platinum. Platinum is a refractory metal. Its melting point is 1773.5 °C. Only in the first half of the 19th century people learned to process platinum.