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The world's largest cut and faceted diamond.
The world's largest cut and faceted diamond.
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A collection of brown diamonds in the National Museum of Natural History, Washington, D.C. The pear-shaped pendant at the bottom of the necklace weigh
A collection of brown diamonds in the National Museum of Natural History, Washington, D.C. The pear-shaped pendant at the bottom of the necklace weighs 67 carats (13.4 g).
Pure diamonds, before and after irradiation and annealing. Clockwise from left bottom: 1) Initial (2×2 mm) 2–4) Irradiated by different doses of 2-MeV
Pure diamonds, before and after irradiation and annealing. Clockwise from left bottom: 1) Initial (2×2 mm) 2–4) Irradiated by different doses of 2-MeV electrons 5–6) Irradiated by different doses and annealed at 800 °C.