The ornamental design for a jewelryclaspassistingdevice, as shown and described.
FIG. 1 is a perspective view of the jewelry clasp assisting device showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a right elevation view thereof;
FIG. 5 is a left elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines depicting the internal features of the claimed design in the drawing are for illustrative purposes only and form no part of the claimed design.