The ornamental design for a jewel, as shown and described.
FIG. 1 is a front perspective view of the present invention.
FIG. 2 is a front elevation view of FIG. 1, the rear elevation being a mirror image thereof.
FIG. 3 is a bottom plan view of FIG. 1; and,
FIG. 4 is a top plan view of FIG. 1.
The surfaces are lightly lined to show contour, but no claim is made to a particular surface shading, texture, or color, and these shadings form no part of the claimed design.