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New calculations indicate that diamonds may not have any phase changes at pressures below 23×1011 N m−2 (23 Mbar) (M. T. Yin and M. I. Cohen, Physical Review Letters, 50, 2006, 1983). The importance of this result of course affects the applications of diamonds beyond their value as gem stones. Single crystal diamonds have served as very strong windows for the transmission of a range of radiation spectra in high-pressure experiments. The ultimate strength of diamonds, however, could mark the limit of experiments at 1 Mbar and higher pressures.