The ornamental design for a pendantnecklace, as shown and described.
FIG. 1 is a front perspective view of a pendant necklace according to my design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a back elevational view thereof;
FIG. 4 is a side elevational view thereof;
FIG. 5 is a top elevational view thereof; and,
FIG. 6 is a bottom elevational view thereof.
The broken line showing of various features, including the chain and connection, is for the purpose of illustrating unclaimed portions of the pendant necklace and forms no part of the claimed design.