Some info on engagements

In the United States, Canada, and the United Kingdom, an engagement ring is worn on the fourth finger of the left hand; the custom in Continental Europe and other countries is to wear it on the right hand. This tradition is thought to be from the Romans, who believed this finger to be the beginning of the vena amoris ("vein of love"), the vein that leads to the heart.^{[citation needed]} Romantic rings from the time of the Roman Empire and from as far back as 4 AD often resemble the Celtic Claddagh symbol (two hands clasping a heart) and so it is thought that this was used as some symbol of love and commitment between a man and a woman. Some others suggest that the rings could be symbolically linked to slave shackles, and thus symbolize the future bondage of husband and wife. However, this is all speculation.