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Diamond is the hardest known natural material (third-hardest known material below aggregated diamond nanorods and ultrahard fullerite), and is the more costly of the two best known forms (or allotropes) of carbon, whose hardness and high dispersion of light make it useful for industrial applications and jewellery.The name “diamond” derives from the ancient Greek adamas (áäÜěáň; “invincible”). |
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