We claim the ornamental design for a beverage coaster, as shown and described.
FIG. 1 is a perspective view of the beverage coaster showing our new design;
FIG. 2 is a top view of the coaster of FIG. 1;
FIG. 3 is a front view of the coaster of FIG. 1, the rear view being identical thereto;
FIG. 4 is a left side view of the coaster of FIG. 1, the right side view being identical thereto;
FIG. 5 is a bottom view of the coaster of FIG. 1; and,
FIG. 6 is a cross-section view taken along line 6—6 of FIG. 2, provided for illustrative purposes to show contours of the claimed external surface and otherwise forms no part of the claimed design.
Features shown in broken lines in the drawings are not part of the claim.