2. Diamond is a simple crystal composed of carbon element formed in the deep part of the earth at high pressure and high temperature, which refers to polished diamond;

3. Diamond is a colorless octahedral crystal, composed of pure carbon, which is connected by carbon atoms with tetravalent bonds. This is the epitaxial data of the hardest substance known to exist in nature at present:

Physical properties of diamonds:

1, hardness

Mohs hardness 10, new Mohs hardness 15, microhardness 10000kg/mm2, which is 1000 times higher than that in time and 150 times higher than that in corundum. The hardness of diamond is directional. The hardness of octahedral crystal face is greater than that of rhombohedral crystal face, and the hardness of rhombohedral crystal face is greater than that of hexahedral crystal face.

Step 2 color

Diamonds come in various colors, ranging from colorless to black, of which colorless is particularly preferred. They can be transparent, translucent or opaque. Many diamonds are yellow, mainly because they contain impurities.

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