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Several non-diamond materials, which include cubic zirconia and silicon carbide and are often called diamond simulants, resemble diamond in appearance and many properties.Special gemological techniques have been developed to distinguish natural diamonds, synthetic diamonds, and diamond simulants.Diamond is renowned for its superlative physical qualities, most of which originate from the strong covalent bonding between its atoms.In particular, it has the highest hardness and thermal conductivity of any bulk material.The 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.

The dispersion of white light into spectral colors is the primary gemological characteristic of gem diamonds.

a weaker zone surrounding the central craton that has undergone compressional tectonics. Lamproites with diamonds that are not economically viable are also found in the United States, India and Australia.

Kimberlites can be found in narrow (1–4 meters) dikes and sills, and in pipes with diameters that range from about 75 meters to 1.5 kilometers.

Diamonds are thought to have been first recognized and mined in India, where significant alluvial deposits of the stone could be found many centuries ago along the rivers Penner, Krishna and Godavari.

Diamonds have been known in India for at least 3,000 years but most likely 6,000 years.

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