How do I ask for it back?

I recently broke up with my ex during lockdown after we were together for 6 months and realised that I very recently bought her a necklace for her birthday.

And that shit was expensive, and wanted to ask for it back so I can keep it for when I start a new relationship. Instead of having to spend money again.
So I wanted to know if there was anyway I could convince her to give it back without coming across as rude or an arsehole?

How do I ask for it back?
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