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machzibia Welcome to TPF!
I have the Tiffany RG Elephant charm, and a 18" thin RG chain, also from Tiffany. Most of the time I layer with my DBTY 16" chain, as pictured (sorry for the bad lighting!). I don't know my neck size, but the 16" chain for the charm didn't sit well on me
I don't think you NEED to get the matching chain, but I personally think the Tiffany RG is a little less rosy than some other jewelers, so it could be hard to match. Although unless someone was looking super closely, they probably wouldn't know the difference. Tiffany jewelry also lasts a long time so another reason I would say it's worth it to spend the money.
Good luck and congrats on a great piece!
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