By replacing the anvils in a diamond cell with transparent gem materials, a gem anvil cell (GAC) has been constructed for high‐pressure generation. We reached pressures of 8.9 and 7.8 GPa with cubic zirconia and sapphire anvil cell, respectively. For high‐temperature studies the cell can be heated to temperatures as high as 2000 °C with resistive heating of the gasket. Simultaneously high temperature and pressure approaching 1700 °C and 6 GPa were obtained as indicated by the direct conversion of graphite to diamond in the high‐temperature GAC.