I heard that it isn’t a segula and doesn’t have a mikur. The basis of the idea is that the Kallah is not allowed to wear jewlery to the chuppah and she will be conserned that something can happen to it as she is going under the chuppah and it will disturb her thoughts while Davening etc. Therefore, she gives it to a friend whom she trusts will guard it and return it to her after the chuppah. Since her friend allows to go to the chuppah with a clear head Hashem will answer the Tefilah of the friend in teh Zchus of the chessed of allowing the kallah to go to her chuppah with minuchas hanefesh.
heard of it and lots of my friends have done it but I never had that “zechus” to actually wear it! I dont think it has any mekor and I think its just made up!
I held onto (not wore) the chosson’s jewlery a couple of times.Somehow it became a thing to give it to your closest friends or ppl who need to get married.Peace.
It is a segulah and I don’t know where it comes from. I don’t know if it brought down in a sefer or it was brought over from Europe but I know that it is something that was handed down for generations.