An engagement ring is a ring indicating that the person wearing it is engaged to be married, especially in Western cultures. In the United Kingdom, Ireland and North America, engagement rings are traditionally worn only by women, and rings can feature diamonds or other gemstones. In other cultures men and women wear matching rings. In some cultures, engagement rings are also used as wedding rings.

Conventionally, the woman's ring is presented as a betrothal gift by a man to his prospective spouse while he proposes marriage or directly after she accepts his marriage proposal. It represents a formal agreement to future marriage. Rings can be bought by the man, the woman, the couple together, or by each partner for the other.

In North America and the United Kingdom, 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. After marrying, the couple may wear both engagement rings and wedding rings, or just their wedding rings, as they prefer. Some brides have their engagement and wedding rings permanently soldered together after marriage.

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