Friendship, love and loyalty are represented by this historic celtic design. A opal claddagh ring with your birthstone or favorite color makes it even more significant. The celtic knot is an ancient symbol of the journey of life. With no beginning and no end, the knot represents the timeless nature of our spirits and the world we live in. Opal is known as the gem of brilliance and mystery and is the birthstone for the month of October. You are currently viewing the items below in 14K Gold.