The ornamental design for a jewelry-making disc, as shown and described.
FIG. 1 is a front, top, and left side perspective view of a jewelry-making disc showing our new design according to a first embodiment;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof; and,
FIG. 6 is a right side elevational view thereof.
The broken lines in the drawings showing portions of the jewelry-making disc are included for the purpose of illustrating environmental structure and form no part of the claimed design.