In 1947 the slogan "a diamond is forever" was introduced.
This idea was popularized by Henry Swinburne in A treatise of Spousals, or Matrimonial Contracts (1686).
Some brides have their engagement and wedding rings permanently soldered together after the wedding.
In many countries, engagement rings are placed on the ring finger of the left hand.
In the 20th century, if he could afford it, the typical Western groom privately selected and purchased an engagement ring, which he then presented to his desired bride when he proposed marriage.
In countries where both partners wear engagement rings, matching rings may be selected and purchased together.