) is only 5,730 years—that is, every 5,730 years, half of it decays away.
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Thus they probably formed at a depth of 100–200 km.
Geologists believe that the ones we find must have been transported supersonically to the surface, in extremely violent eruptions through volcanic pipes.
Some are found in these pipes, such as kimberlites, while other diamonds were liberated by water erosion and deposited elsewhere (called alluvial diamonds).
According to evolutionists, the diamonds formed about 1–3 billion years ago.
C at all if they really were over a billion years old, yet the radiocarbon lab reported that there was over 10 times the detection limit.