Our pewter Celtic knot and black onyx diffuser pendant keeps the living heritage of Celtic knotwork alive in this meticulous design. The center knot design features an onyx stone for an especially dramatic effect. The back of the pendant is smooth, hammered pewter. Suitable for use as an essential oil diffuser or simply as a striking necklace, this piece makes an impressive statement from every angle! Hand made in the USA from lead free pewter. 24″ chain included.