Dr Baumgardner sent a diamond for C-14 dating. It was the first time this had been attempted, and the answer came back positive—i.e. the diamond, formed deep inside the earth in a ‘Precambrian’ layer, nevertheless contained radioactive carbon, even though it ‘shouldn’t have’. This is exceptionally striking evidence, because a diamond has remarkably powerful lattice bonds, so there is no way that subsequent biological contamination can be expected to find its way into the interior.