Which is the oldest known diamond till date
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http://www.amnh.org/exhibitions/diamonds/age.html
http://www.msnbc.msn.com/id/20394852/
It is possible that the Kohinoor was the first historically documented large diamond, with specific references dating back to the 1300s. Several large diamonds are mentioned in even earlier texts, and the Kohinoor may have been found as early as 2000 BC. Since the world's only known source of diamonds at that time was the Golconda district in India, one of these large diamonds must have been the first to be discovered, and it could have been the Kohinoor, although there is no way to confirm this.
http://en.wikipedia.org/wiki/Koh-i-Noor
http://www.diamondtutorials.com/articles/diamonds.tutorials/71/The_Kohinoor_Diamond.html
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Quote from "news.nationalgeographic.com" National Geographic News - August 22, 2007
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"No one would have really predicted that diamonds were in there," said Simon Wilde, a geologist at Curtin University of Technology in Perth and a member of the team that made the find.
The discovery suggests that seas of molten lava that covered primordial Earth had cooled down faster than had previously been thought.
The discovery is a shocker to geologists, many of whom believed that the molten lava and volcanic activity persisted on Earth's surface for at least 500 million years after our planet formed some 4.5 billion years ago.
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A microscope image reveals tiny diamond fragments (center) encased in a zircon crystal. Scientists say the diamonds found inside the crystal are the oldest ever found, at some 4.25 billion years old.
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