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DIAMOND
Diamond is the hardest natural material known, where hardness is defined as resistance to scratching.[10] Diamond has a hardness of 10 (hardest) on Mohs scale of mineral hardness.[11] Diamond's hardness has been known since antiquity, and is the source of its name.
Diamonds are thought to have been first recognized and mined in India, where significant alluvial deposits of the stone could then be found many centuries ago along the rivers Penner, Krishna and Godavari. Diamonds have been known in India for at least 3000 years but most likely 6000 years
Diamonds have been treasured as gemstones since their use as religious icons in ancient India. Their usage in engraving tools also dates to early human history.[4][5] Popularity of diamonds has risen since the 19th century because of increased supply, improved cutting and polishing techniques, growth in the world economy, and innovative and successful advertising campaigns. They are commonly judged by the “four Cs”: carat, clarity, color, and cut.
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