The ornamental design for a diamond with 105 faces, as shown and described.
FIG. 1 is a top plan view of a diamond with 105 faces, showing my new design;
FIG. 2 is a bottom plan view thereof; and,
FIG. 3 is a front elevational view thereof, the back elevational view, the left side elevational view and the right side elevational view being identical thereto.