Friday, 16 September 2016

Types of Diamonds

Diamonds are precious & rare stones which are found inside the earth’s surface. A natural diamond is a gemstone/precious stone made up of carbon.Due to environmental concerns Lab Grown Diamonds also called as Lab Created Diamonds are being preffered over mined diamonds.
Lab Created Diamonds are created in a controlled environment by using high-pressure high-temperature” method (HPHT), and the “chemical vapor deposition” method (CVP).
Diamonds can be classified into 4 types:-1a,1b,2a,2b.Diamonds are classified according to the level of their chemical impurities.
Type 1a:-In type 1a diamonds nitrogen atoms are clustered together within the carbon lattice.They are of pale yellow colour.When the nitrogen atoms are present in groups of three they absorb wavelengths of visible light on the blue end of the spectrum.Hence the light that is reflected appears to be yellow.Around 98% of the diamonds are type 1a.Type 1 a diamonds are futher classified into 1aA and 1aB.1aA are diamonds with nitrogen in aggregate pairs and 1aB are contains aggregates of four nitogen atoms.
Type 2a :-Type IIA diamonds are considered as purest form of diamonds.They contain no or very less impurities.They are considered as most  rare and valuable type of diamonds.They contain very little amount of nitrogen so they don’t easily absorb short wave light.They are colourless and are almost transparent.
Type 1b Diamonds:-In 1B diamonds single nitrogen atoms instead of clusters are dispersed throughout the crystal lattice.As they are scattered a lot of visible light is absorbed resulting in darker colours.
Type 2b Diamonds:-. Type IIB Diamonds do not contain nitrogen,but they contain boron The presence of boron makes these diamonds electrically conductive.All naturally blue diamonds belongs to Type 2b.They are extremely rare and form 0.1 % of the diamonds.

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