Let it swing.
A short curb chain with an 8mm round zirconia at the end, made to hang from the earstud you already love. It moves when you move and adds length to a stack without a new piercing. Sold as a single charm, earstud not included.
Wear it with: Hang it from a Crystal Diamond Earstud or a Ball Earstud, then add a Chunky Kos Earcuff higher up.