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Labs are now churning out large white diamonds that are indistinguishable from those found in nature. The diamond on the left is lab-grown, while the uncut version of the one on the right was created by millions of years of intense pressure. Michael Rubenstein for NPR hide caption

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Michael Rubenstein for NPR

Lab-Grown Diamonds Come Into Their Own

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A necklace of Saint Januarius, in gold, silver and precious stones, is displayed in Rome. The riches are from a treasure trove in Naples that is said to be worth more than the British crown jewels. Gabriel Buoys/AFP/Getty Images hide caption

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Gabriel Buoys/AFP/Getty Images