The ornamental design for a foodservingplate with diamond pattern rim, as shown and described.
FIG. 1 is a perspective view of a food serving plate with diamond pattern rim showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a side elevational view thereof, all sides being the same;
FIG. 4 is a bottom plan view thereof; and,
FIG. 5 is a bottom plan view of a food serving plate with diamond pattern rim showing a second embodiment of my new design, all other sides the same as the first embodiment.