The ornamental design for a fireplaceragusa, as shown and described.
FIG. 1 is a first front perspective view of a fireplace ragusa showing my new and original design;
FIG. 2 is a front side elevation view thereof;
FIG. 3 is a right side elevation view thereof; and,
FIG. 4 is a left side elevation view thereof.
The bottom, top and back sides of the fireplace ragusa form no part of the claimed design. The broken lines in the drawings represent unclaimed environmental subject matter.