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Sure enough, the diamonds submitted for radiocarbon analyses did contain detectable, significant levels of carbon-14, equivalent to an age of around 55,000 years.
Again, the laboratory did repeat analyses and discounted any possibility that this carbon-14 was due to contamination, in situ to the diamonds or added in the laboratory.
At 1–2 billion years old, these diamonds, which are formed deep inside the earth, are regarded as being related to the earth’s early history.
They yield essentially identical radiocarbon “ages” ranging from 69,400 years to 70,600 years.
This suggests the carbon-14 was evenly distributed through this diamond, which is consistent with it being intrinsic carbon-14, and not contamination.
Confirmation that there is in situ carbon-14 in diamonds has now been reported in the conventional literature.3 R. Taylor of the Department of Anthropology at the University of California–Riverside and of the Cotsen Institute of Archaeology at the University of California–Los Angeles teamed with J.
Southon at the Keck Accelerator Mass Spectrometry Laboratory of the Department of Earth System Science at the University of California–Irvine to analyze nine natural diamonds from Brazil.
Eight of the diamonds yielded radiocarbon “ages” of 64,900 years to 80,000 years.
The ninth diamond was cut into six equal fragments, which were each analyzed.
That was because the diamonds were mounted directly in the beam within the analytical instrument, whereas in the RATE study the diamonds were combusted to convert the carbon to carbon dioxide, which was then converted to graphite that was analyzed in the instrument.
That process may have introduced some more carbon-14 to the analyses.
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