Silva Vinh. Diamonds. May 09th , 2017.
Well then do diamonds melt? A diamond has an average melting temperature of 3,550C in a vacuum. If a diamond is heated to that temperature in normal environmental conditions, it may either become charred, will burn off, or show no effect. But in a vacuum, it is possible to melt small quantities of diamonds. When the crystals are subjected to super-strong magnetic fields, and a pressure a million time the normal value, small amounts of the diamond are observed to melt and liquefy.
Whatever may be the method you choose for cleaning a diamond ring, you have to make sure that you dry the ring as well as the stone, as soon as possible. A lint-free cloth is always preferred, as air drying may cause water spots on the stone.
As our molten planet cooled down and formed a crust, volcanic activity and magma pushed these diamonds to the surface, through volcanic outbursts. In time, these tunnels of magma flow, just below the surface, solidified to form rocks. Hardened volcanic pipes got formed (known as Kimberlite and Lamproite pipes), which encased millions of diamonds. These are the sites, where the biggest diamond mines in the world are situated.
Sapphires are formed during the metamorphosis of rocks and minerals, which also takes place deep below the Earth's surface. The extreme temperature and pressure there causes rocks and minerals to change form into liquid magma. During earth shifts, this molten magma cools down, resulting in recrystallization of the minerals dissolved in it, which finally leads to the formation of different-colored sapphires. White sapphires, in particular, are formed during the metamorphic recrystallization of minerals dissolved in igneous rocks.
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