Blind Ringing

When men buy a ring from a store without asking for they're ladies size, when they get home they try it on their lady and if it fits, then she's the correct one, if it's bigger then it'll be a lovely relationship with chances of being together forever but not 100% and if it's smaller then it's a total red flag and shouldn't be dated

X: she's the one for me

Y: Why is that?

X: The ring fucking fit.

Y: You mean blind ringing