The ornamental design for a jewelry accessory, as shown and described.
FIG. 1 is a top, front, right side, perspective view of a jewelry accessory according to the present disclosure shown in a position of use on an unclaimed chain with an unclaimed pendant both drawn in broken lines;
FIG. 2 is a top, front, perspective view of the jewelry accessory of FIG. 1 shown removed from the unclaimed chain;
FIG. 3 is a front view thereof;
FIG. 4 is a back view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is a top view thereof.
The broken lines in FIG. 1 illustrating a chain and heart shaped pendant depict environment and form no part of the claimed design. All other broken lines depict portions of the jewelry accessory that form no part of the claimed design.