Claddagh Sterling Silver Pendant with Marcasite & Irish Connemara Green Marble w/ 18" Silver Chain Sterling Silver with Marcasite and Irish Connemara Marble Pendant. Irish Connemara Green marble specially selected from the sellers own quarry. This pendant measures 5/8th. inch by 7/8th."(Inches) 18 Inch silver chain. Presented in a stylish gift box..