Studying the dependence of degree (α) and rate (ϑ) phase transformation graphite into diamond on synthesis time at different temperatures developed synthetic diamonds using technology high-pressure high-temperature in a metal melt (HPHT), we determined critical mass diamonds, which indicates entry system stability region graphite, where graphitization occurs. The role implanted metals hydrogen ...

Impact diamonds were found in several inipactites from the Ries crater. Geriiiaiiy including fallout and fallback (crater f i l l ) suevites. a glass bomb, impact melt i-ock and shocked gneiss. These diamonds formed two distinct grain size populations: 50-300 pii apographitic. platy aggregates with surface ornamentation and etching that \vere observed using optical and scanning electron microsc...