Friendship, love and loyalty are represented by this historic celtic design. A lab ruby 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. Lab Ruby is known as the gem of passion and desire and is the birthstone for the month of July. You are currently viewing the items below in 14K Gold.