Wearing an engagement ring on the left middle finger is the best choice because the left hand represents love, and the left middle finger has always had the meaning of love and proposal.
1. Left hand represents marriage, right hand represents love
There is a saying in the way rings are worn that "the left hand represents marriage, and the right hand represents love", and engagement rings are about marriage. It is most appropriate to wear an engagement ring on the left hand.
2. Left middle finger represents proposal
According to the way rings are worn, wearing a ring on the middle finger of the left hand indicates a marriage proposal. Wearing the proposal ring on the middle finger of your left hand signifies the sweetness of your love. But just proposed and haven't gotten married yet, so the ring can't be worn on the ring finger temporarily. You can wear the ring on your middle finger until you officially receive your marriage certificate.
3. Protect the ring from wear and tear
Because most of us are right-handed, wearing an engagement ring on our right hand can be inconvenient for daily work and can easily cause wear and tear on the ring. So wearing a proposal ring on the left hand is more convenient for daily life and can also protect the ring well.