I am a beginner, and this earring already has bones. Generally, soft objects are simulated using fabric, but this earring is hard. I added a coil, but in the rigid body attributes, there seems to be no pin group, and the coil will fall off.
Try Wiggle 2 Addon for a simple solution.
It automatically creates shaking.
Wiggle 2 - Coding / Released Scripts and Themes - Blender Artists Community
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This is quite advanced addon, but I think will suit your work better than Wiggle, which is more soft-bodyish.
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