Christian jewelry can be anything from a cross, to a WWJD pendant, even prayer beads are in; maybe a little extreme, but I have seen a growing popularity all over the place. And even if you are not christian, it does not mean you can’t wear them.
Now a days, wearing jewelry is all about style be it christian jewelry, or regular jewelry. However, over the last decade or so, there has been an increasingly popularity of crosses, it probably has something to do with the rise in horror movies, or even celebrities that wear certain jewelry make it widely popular.