The ornamental design for a gem crown, as shown and described.
A portion of the disclosure of this patent document contains material to which a claim for copyright is made. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office patent file or records, but reserves all other copyright rights whatsoever.
FIG. 1 is a top plan view of a gem crown showing my new design;
FIG. 2 is a front elevational view thereof, the right, rear, and left elevational views being identical to the front elevational view; and,
FIG. 3 is a front right corner elevational view thereof, the rear right, rear left, and front left corner elevational views being identical to the front right corner elevational view.
It being understood that the broken lines are for exemplary illustrative purposes only and form no part of the claimed design.