how hard is it?
Diamond is the hardest known natural material on both the Vickers scale and the Mohs scale.
Diamond
Diamond is the hardest known natural material on both the Vickers scale and the Mohs scale. Diamond's great hardness relative to other materials has been known since antiquity, and is the source of its name.

Diamond hardness depends on its purity, crystalline perfection and orientation: hardness is higher for flawless, pure crystals oriented to the <111> direction (along the longest diagonal of the cubic diamond lattice). Therefore, whereas it might be possible to scratch some diamonds with other materials, such as boron nitride, the hardest diamonds can only be scratched by other diamonds and nanocrystalline diamond aggregates.
we know that diamonds did not form from coal because UNANSWERABLE can you state any of its properties? Yes -  It is the hardest and least compressible. It has the highest thermal conductivity and the highest sound velocity. It has low adhesion and friction, and its coefficient of thermal expansion is extremely low. Its optical transparency extends from the far infrared to the deep ultraviolet and it has high optical dispersion. It also has high electrical resistance. It is chemically inert, not reacting with most corrosive substances, and has excellent biological compatibility. when was it discovered? Diamonds are thought to have been first recognized many centuries ago 3,000years but most likely 6,000years how is it used politically? UNANSWERABLE what is its status in space? They are very common in space. is there any carbon content in it? Yes - Diamond is a solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic. what is meant by the term you mentioned in the last? The diamond cubic crystal structure is a repeating pattern of 8 atoms that certain materials may adopt as they solidify. can you mention one of its mechanical features? Compressive strength. what is the early usage of the above mentioned solid form of carbon? Diamonds have been treasured as gemstones since their use as religious icons in ancient India. where is its market? UNANSWERABLE is it colorful? No - pure diamond transmit visible light and appear as a clear colorless crystal.
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Diamond [SEP] Hardness
Diamond is the hardest known natural material on both the Vickers scale and the Mohs scale. Diamond's great hardness relative to other materials has been known since antiquity, and is the source of its name. Diamond hardness depends on its purity, crystalline perfection and orientation: hardness is higher for flawless, pure crystals oriented to the <111> direction (along the longest diagonal of the cubic diamond lattice). Therefore, whereas it might be possible to scratch some diamonds with other materials, such as boron nitride, the hardest diamonds can only be scratched by other diamonds and nanocrystalline diamond aggregates. The hardness of diamond contributes to its suitability as a gemstone.