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I sometimes buy jewelry when I'm down, but I'm not sure this is the best idea because whenever I wear it I am reminded of whatever trauma provoked me to buy it in the first place. I hope you find something that makes you feel wonderful.

Yes, I've done that too, bought jewelry for myself, but I look at it like I'm buying it for myself for getting through the trauma, so look at it as love for myself.
I haven't purchased anything so far, but did find a pair of shoes I may order ;)