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The secret behind the world's rare blue diamonds
The Farnese Blue is a 6.16-carat, pear-shaped blue diamond. It was given to Elisabeth Farnese, the Queen of Spain, in 1715. It sold for $6.7million at an auction in May. 3. SOUNDBITE (English) [Daniela Mascetti, Jewellery Specialist, Sotheby's] It is a beautiful, beautiful color. It's a point of blue that once you see once, you never forget. It's really the color of the deep ocean, magical, really magical. The Hope Diamond is one of the most famous jewels in the world. It was donated to the Smithsonian Museum. The 45.52-carat diamond was long thought to have a curse, bringing bad luck to its owners. But Smithsonian officials said it has been kind to them, drawing throngs of visitors. Just one out of 200,000 diamonds are blue. 15. SOUNDBITE (English) [Steve Shirey, Geochemist, Carnegie Institution for Science] "Blue diamonds are among the rarest diamonds. Because of that they're very highly prized and they've had an important place in history." Scientists have long known that their blue tint comes from traces of boron in the diamond. But the element is mostly found near the Earth's surface, not where diamonds are typically formed. New research has found that blue diamonds are formed at depths of more than 410 miles. 31. SOUNDBITE (English) [Steve Shirey, Geochemist, Carnegie Institution for Science] "To explain our main finding that blue diamonds are among the deepest ever formed, the question is how does the boron get down there? Our hypothesis is that boron, which is normally only found in the Earth's surface, hitches a ride to the lower mantle in oceanic plates that descend in a process known to the geologists as subduction." Diamond deposits eventually reach the surface through volcanic eruptions. Diamonds are forever, whether blue, white, pink, or yellow. Many consider them to be a symbol of love, and are prepared to pay a great deal for them.