The ornamental design for a jewelryclasp having a button, as shown and described.
FIG. 1 is a front isometric view showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a front side view thereof;
FIG. 5 is a rear side view thereof;
FIG. 6 is a left view thereof;
FIG. 7 is a right side view thereof;
FIG. 8 is an enlarged isometric view of the circled portion shown in FIG. 1; and,
FIG. 9 is an enlarged top plan view of the circled portion shown in FIG. 2.
The broken lines showing the top portion of the button illustrate portions of the article that form no part of the claimed design. The broken lines showing a jewelry article illustrate environmental structure that forms no part of the claimed design.