There are No traditions when it comes to love

Vena amoris is a Latin name meaning, literally, "vein of love".
Traditional belief established that this vein ran directly from the heart to the 
fourth finger of the left hand.
This theory has been cited in western cultures as one of the reasons the 
engagement ring and/or wedding ring was placed on the fourth finger,
or "
ring finger". This traditional belief is factually inaccurate as all the fingers in the hand have a similar vein structure. - wikipedia