The meaning of a trinity ring depends on the jewelry design. Three interlocking, different-colored precious metal bands provide the symbolism in a Cartier-created "Trinity" ring. The Holy Trinity is symbolized by a Celtic trinity knot ring.
Pink, yellow and white gold stand for love, fidelity and friendship in the Trinity ring style pioneered by the Cartier jewelry brand in 1924. The Celtic trinity knot boasts a longer tradition. This ring, also referred to as the Triquetra, features a three-cornered knot whose design dates back over 1,000 years. Intricate knot designs are a central part of Celtic culture; triskelion, quaternary and mandala patterns are other examples.