In contemporary Ireland, It is traditional for a man to give a loved one a trinket such as a necklace or ring signifying his affection towards her. It is believed to represent the three promises of a relationship such as to love, honour, and protect. It is common for the design of the Trinity Knot to be engraved on a wedding ring and attaches to a Claddagh ring (another Irish traditional ring given for friendship or engagement).
The symbol has become well-known due to its use on the cover of the "Book of Shadows" used by the three sisters on the American TV show Charmed. It represents the three sister witches working together as one.
Size of symbol: 2.5cm x 2.5cm approx
Length of Chain: 52cm approx
Material: Zinc alloy