The ornamental design for necklace, as shown and described.
FIG. 1 is a front prospective view of the necklace showing the manner in
which the necklace is to be worn; and,
FIG. 2 is a rear view of the necklace of FIG. 1.
The broken lines which define the bounds of the design form no part
thereof.
It being understood that the broken lines on the front center of each
larger sphere in FIG. 1 indicates the boundary between the claimed and
unclaimed subject matter.