Necklace Mesh Help!

hi! welcome to the forums! My questions is, from where exactly are the meshes from? Each mesh has it's unique weight/bones and uv_1 configurations. If you place an earring mesh on the necklace space, then it's going to be missing all the "interactions" it has with the neck.

You'll have to re do those things so that all the parts of the mesh match.

Create another save of the blend you're going to work with (so you have a back up of the previous)

i recommend selecting only the part that you're having issues with by going into edit mode, selecting it and pressing p / selection to separate it into other group so that you don't mess the other parts' configurations. When finished with the steps (below), join the parts again.

- use this tip to make a smooth transfering of both things below.
- do transfer weight (remove the bones you already have first).
- and uv_1.

If after doing this to the separated part still doesn't make it match, then you'll have to do it on the whole accessory.