The ornamental design for the multi-faceted gemstone, as shown and described.
FIG. 1 is a top view of a multi-faceted gemstone in a first orientation showing my new design;
FIG. 2 is a bottom view of the multi-faceted gemstone in the first orientation;
FIG. 3 is a front view of the multi-faceted gemstone in the first orientation, the rear view, left side view and right side view being identical thereto;
FIG. 4 is a perspective view of the multi-faceted gemstone in the first orientation;
FIG. 5 is a top view of the multifaceted gemstone in a second orientation;
FIG. 6 is a bottom view of the multi-faceted gemstone in the second orientation;
FIG. 7 is a front view of the multi-faceted gemstone in the second orientation, the rear view, left side view and right side view being identical thereto; and,
FIG. 8 is a perspective view of the multi-faceted gemstone in the second orientation.