Diamonds. Sunday , May 07th , 2017 - 14:00:13 PM
✦ On December 23, 1980, the largest diamond of the Mir mine was found, which weighed 342.5 carats (68 g) and was given the name "26th Congress CPSU."
A typical rose cut diamond has a unique shape and facet arrangement. It has a flat bottom and an elevated pointed dome, with triangular facets forming a point. The dome is generally in the shape of a hemisphere or a pyramid. The number of triangular facets in a rose cut diamond may vary between 12 to 24. Generally it has a lower tier of triangular facets, which in combination with the upper tier, gives the look of a rose bud. The facets in the upper tier are called star facets, and the ones in the lower tier are known as the diagonal facets. Usually, the middle portion of a rose cut diamond has six triangular facets, which meet at a point in the center. The outline of this diamond is usually circular, but there are oval, hexagonal, and pear-shaped domes. The facet arrangement in rose cut diamonds are usually in multiples of six.
Sometimes, diamonds can be formed on the surface of the Earth, at sites that have sustained meteorite strikes. This is due to the high temperature and pressure produced on the Earth's surface, as a result of collision with large meteorites.
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