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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. In the United States and Canada, where only women traditionally wear engagement rings, women also occasionally present their partners with an engagement gift.

Like all jewelry, the price for an engagement ring varies considerably depending on the materials used: the design of the ring, whether it includes a gemstone, the value of any gemstone, and the seller. The price of the gemstones, if any, in the ring depends on the type and quality of the gem. Diamonds have a standardized description that values them according to their carat weight, color, clarity and cut.