The melting of pyrope Mg3Al2Si3O12 has been determined experimentally at pressures up to 10 GPa. Pyrope melts congruently in the pressure range 3.5--10 GPa. At pressures below 7 GPa, aluminous enstatite of pyrope compositon crystallizes during quenching, whereas quench pyrope appears at higher pressures. Moreover, the slope of the melting curve of pyrope decreases significantly at pressures above 7 Gpa. The changes in both the nature of the quench phase and the slope of the melting curve suggest a pressure-induced coordination change for Al3+ in pyrope melt at around 7 GPa. This pressure-induced coordination change of Al3+ probably occurs even in magmatic liquids generated in the deep upper mantle and should affect some of their physical properties.