Triquetra: Celtic Trinity Knot Pendant with diamonds.

Triquetra: Celtic Trinity Knot silver pendant with studded CZ diamonds and bail of Trinity Knot makes it more classy and beautiful.

Irish Christians took the concept of the three interlocking shapes and repurposed it to signify the holy trinity: the father, the son, and the holy spirit. The never-ending loops themselves are said to reference the concept of infinity.