- A ring given by a man to a woman when they agree to marry
- a ring given and worn as a sign of betrothal
- Especially in Western cultures, an engagement ring is a ring indicating that the person wearing it is engaged to be married. In the United Kingdom, and North America, engagement rings are traditionally worn only by women, and rings can feature gemstones.
- The Engagement Ring (B?xt Üzüyü) is a full-length Azerbaijani comedy film released in 1991. The film plot is based on the same-titled novel by Azerbaijani writer Vagif Samadoghlu.
- Tanzanite is the blue/purple variety of the mineral zoisite which was discovered in the Meralani (Merelani) Hills of Northern Tanzania in 1967, near the city of Arusha. It is used as a gemstone.
- A deep blue-violet variety of zoisite.
- A variety of zoisite that has naturally occurring shades of blue, green, yellow, pink, brown and khaki but virtually all gemstone quality crystals are heat treated to produce the highly valued shades of sapphire blue, amethyst and blue violet. On Mohs' scale of hardness, tanzanite is 6.5-7.
- A blue or violet gem variety of zoisite, containing vanadium