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Duncan Pay © GIA, courtesy Carnegie Institution of Washington “Let me try to place into a broader context what the good of this diamond work is,” Shirey begins.

“In this case we’re seeking the rejects of the gem trade,” says Shirey.Research using the rhenium-osmium decay system proves that some diamonds are of remarkable antiquity, says Shirey.“They’re sometimes the oldest minerals we can find on the earth…up to 3.5 billion years old, whereas the earth is only 4.5 billion years old, so they’re often three-quarters of the age of the earth.” Shirey adds that diamonds are also special because they’re the deepest minerals we can obtain as natural samples to study the earth.“So in one mineral species,” he says, “you have the deepest, the oldest, and the most resistant to secondary effects mineral that you can get, so it makes them very, very unique specimens.” Shirey tells us that the osmium-rhenium radioactive decay system allows researchers to date individual inclusions.Previous dating techniques required researchers to collect inclusions of other minerals—including garnets and zircon—from many different diamonds to obtain an age.

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