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. A Onyx celtic knot combines these concepts with the spiritual attributes of the Onyx . Black and gold make a beautiful and elegant combination. A black onyx ring is a perfect accessory for any outfit. Black and gold make a beautiful and elegant combination. A black onyx ring is a perfect accessory for any outfit.