The ornamental design for a pizzastonelifter, as shown and described.
FIG. 1 is a top rear perspective view of a pizza stone lifter showing our new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a rear elevational view thereof; and,
FIG. 6 is a left side elevational view thereof, the right side being a mirror image.
The broken lines shown in FIGS. 1-6 represent a front plate-like handle and a secondary spiral wire handle. Both handles can be gripped for lifting a pizza stone retained in the turned-in wire rod footings at the bottom of the pizza stone lifter. The broken line structures form no part of the claimed design.