I HAVE A RING THAT MY GRANDMOTHER LEFT ME THAT I HAVE TO SELL. IT IS FAIRLY OLD (MAYBE ABOUT 40 YEARS OR MORE) IT IS A PLATINUM SETTING AND THE CENTER DIAMOND I AM TOLD IS A KITE SHAPE. I HAVE NO IDEA HOW TO GO ABOUT SELLING THIS RING BUT I URGENTLY NEED TO DO SO. ANY HELP WOULD BE APPRECIATED.