The ornamental design for a necklace, as shown and described.
FIG. 1 is a perspective view of a necklace incorporating the design of the
present invention. The light lines and the dash lines illustrate a pendant
and the wearer of the necklace, neither of which constitute a part of the
present invention;
FIG. 2 is a front elevational view of the necklace design of FIG. 1;
FIG. 3 is a rear elevational view of the necklace of FIG. 1;
FIG. 4 is a top plan view of the necklace of FIG. 1; and,
FIG. 5 is a bottom view of the necklace of FIG. 1.