Heavy cardstock or matt board, centre cut out. Attach a stand or something to hold upright.
Nylon line stretched across, held with clips or tape in TWO places. One to hang the earring off, the other to stabilized the earring, stop them from swinging for 15 minutes, twisting, or turning to an awkward angle. The earrings hang from the top line, and rest against the bottom one.
So you get this ... retouch out the lines, or increase the lightness to get them to disappear.
Instead of this.
Nice drusies, eh?