The ornamental design for a chalicestem, as shown and described.
FIG. 1 is an elevated front left perspective view of the upper and side portions of the chalice stem showing the new design;
FIG. 2 is a front perspective view of the chalice stem showing the new design;
FIG. 3 is a rear perspective view of the chalice stem showing the new design;
FIG. 4 is a right perspective view of the chalice stem showing the new design;
FIG. 5 is a left perspective view of the chalice stem showing the new design;
FIG. 6 is a top view thereof;
FIG. 7 is a sectional view of the chalice stem taken from line 7-7 of FIG. 2; and,
FIG. 8 is tilted bottom and front/side angled view of the chalice stem showing the new design.
The broken lines and the unshaded regions showing of the cup and base of the chalice are for environmental purposes only and form no part of the claimed design.