its called a claddah, quite famous in Ireland. I think. if its a ring it depends on which way round it's worn to signify if you are in a relationship or not.
Click on link. Tells you all about it. http://www.galway1.ie/faq/claddagh.htm
I do Not think it is a Claddagh ring as that two hands clasped in prayer on a cross. A Claddagh is two hands holding a heart with a crown on it. I hope you find out what it is.:-D