A historic blue diamond once worn by Indian royalty is expected to fetch between $35m and $50m when it goes under the hammer in May. The 23.24-carat gem, known as the Golconda Blue, is set to lead ...

A lead cast of the French Blue diamond, a mythic item in the French Crown Jewels, was recently found in the mineral collection of the Muséum National d’Histoire Naturelle (MNHN) in Paris. The details ...

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