Silver Celtic jewelry is are remarkable type of jewelry. Celtic jewelry has Celtic cross necklaces and Christian trinity knot jewelry. Then there are Celtic rings and Celtic necklaces to mention just a few types of Celtic jewelry. All this makes Celtic jewelry a cross over type of jewelry.
Cross over jewelry like silver Celtic jewelry is cross over from the point of view of the fact that in one genre of silver Celtic jewelry is crosses from silver Celtic jewelry to Christian jewelry and because it's a pagan type of jewelry it falls under religious jewelry.