Carved into a variety of stones, tbese can be used for decoration, placed on your altar or even worn as a pendant if you so wish, 
Known to many as an Irish Love Knot or a Celtic Love Knot, the Trinity Knot is a beautiful and ancient Celtic symbol, the Trinity Knot or triquetra has been used to symbolize and honor the Mother, Maiden and Crone. 
The word 'Triquetra' comes from the Latin for 'three-cornered' and although its exact origins are unknown. The interconnected triangles have been said to reflect the connection between Earth, Heaven and Hell. 

Gemstone triquetra