which hand do engagement rings go on
In many countries, engagement rings are placed on the ring finger of the left hand. At one time it was believed that this finger contained a vein (the vena amoris) that led to the heart. This idea was popularized by Henry Swinburne in A treatise of Spousals, or Matrimonial Contracts (1686).
In Western countries, it is customarily worn on the left hand ring finger, though customs vary across the world. Before agreeing to marry, a couple may choose to buy and wear pre-engagement rings, also called promise rings.