Have you considered going the pre owned route?
Here's my Large, but i'm a dude.
I don't wear it anymore, but i'm holding on to it, hoping my gal would eventually grow into it.
She looks great with it, but she's stuck on a PAM phase now.
Personally, if your eyes lit up when trying the Large and the Medium was meh to you, get the large. It looks great on your wrist!
Wish you had pics of the Medium though, but seems like your heart is set. Medium might also be too dainty for your wrist.
Good luck with your decision!