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Draw two similar curves apart from each other near the bottom but inside the rectangle. The distance between the two new curves are wider near the center. Draw smaller circles at the middle of the zig-zags at the middle of the crown. Draw outer circles to make the circles look embossed. Erase unnecessary lines.

Summary:
Draw a rectangle of considerable size for the crown's framework. Add a curve connecting the upper left corner of the rectangle to the upper right corner. Draw the zig-zag lines in the middle curve, the straight lines which connect the midpoints of the zig-zags in the bottom curve, and small circles in each tip of the zig-zags. Draw zig-zag lines in between the middle and bottom curves and draw two curved lines which are part below the bottom curve. Draw circles at the center of the zig-zag shapes at the upper part of the crown. Add the details for the sides of the crown. Trace with a pen. Color according to your liking!