The ornamental design for a jewelpiece, as shown and described.
FIG. 1 is a front perspective view of a jewel piece showing my new design;
FIG. 2 is a front view thereof, with the rear viewing being a mirror image thereof;
FIG. 3 is a top view thereof, with the bottom view being a mirror image thereof; and,
FIG. 4 is a side view thereof with the other side view being a mirror image thereof.
The broken line showing of the central jewel, recessed jewels, and parts of the jewel piece, is included for the purpose of showing environmental portions of the jewel piece and forms no part of the claimed design.