This is my modular Jewelry tree. You can make it with either two or three levels and two, three or four arms per level. If you only want two levels then don't print the Level2 file. Joints apart from to the base are keyed so that the arms align. You can mix and match number of arms between levels.

I've borrowed sleeping cat from Lali3d as an option to add to the base as my wife likes cats but you can leave if plain or add your own decoration as required.