The ornamental design for a jewelryclasp, as shown and described.
FIG. 1 is an upper perspective view of a jewelry clasp;
FIG. 2 is a lower perspective view thereof;
FIG. 3 is a side view thereof;
FIG. 4 is a top view thereof; and,
FIG. 5 is a bottom view thereof.
The broken lines in FIGS. 1-5 illustrate an eyelet and chain that connect to the top and bottom ends of the jewelry clasp. Further, the additional broken lines in FIGS. 1-3 illustrate a fastening mechanism for fastening and unfastening the jewelry. These broken lines form no part of the claimed design.