Hope Diamond is a natural fancy dark grey-blue diamond that is one of the most famous diamonds in the world. Photograph: Robert Weldon©GIA. Provided by the Smithsonian Institution.
Blue diamonds are hailed as one of the rarest colored diamonds, mainly because of its formation and special shades. A new industry study shows that blue diamonds may get their color from a surprising source: boron.
According to a new study on the cover of the journal Nature, the international scientific journal, blue diamonds are formed at extreme depths - about four times that of most diamonds. The elemental boron contained in the ancient ocean floor penetrates deeply into the mantle through the movement of the tectonic plates, providing the blue color of the diamond.
This is the first study to study and identify mineral inclusions in very rare and valuable blue diamonds. Analysis of these inclusions revealed that the diamonds formed a deep depth in the presence of submerged or "dive" ancient ocean tectonic plates.
“Blue diamonds like the famous diamonds of hope have been of interest to scientists for decades, but the rarity and high value of these gemstones and their near-lack of mineral inclusions have been major obstacles to research,†said Gemological Institute of America ( GIA) Research scientist Dr. Evan quoted Smith, the lead author of the natural article in the GIA press release. “The opportunity to study these rare diamonds at GIA gives us an insight into their incredible origins.â€
Blue diamonds, also known as Type IIB diamonds, obtain color from trace amounts of boron. The study shows that blue diamonds have a depth of 410 miles (660 km) or more, and boron is scarce into the lower mantle of the Earth.
An extended summary of the paper is available on GIA.Edu.
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