| Diamonds are pure, elemental carbon. Hardest of all gemstones, diamonds have the highest melting point of any substance (3,820 degrees Kelvin), is an excellent heat conductor, and has very low reactivity to chemicals. The English word “diamond” comes from the Greek word adamas meaning “the invincible.” Diamonds were not identified until the first century, and then they were valued as a tool for carving other stones.
Pliny the Elder describes diamond crystals from India around 77 AD. |  |
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