I claim the ornamental design for a display stand for a cremation urn, as shown and described.
FIG. 1 is a top, front, left side perspective view of a display stand for a cremation urn showing my new design;
FIG. 2 is a front view thereof, the rear view being identical;
FIG. 3 is a left side view thereof, the right side view being identical;
FIG. 4 is a top view thereof; and,
FIG. 5 is a bottom view thereof.
The broken line showing of cross at the top of the display stand is for the purpose of illustrating environmental structure and forms no part of the claimed design.