I do not know what the main stone is for sure. It behaves like a jasper (very hard, tight crystalline structure, gets very cold, high shine), so I’m certain it is a jasper, I just can’t figure out what kind! I’ve paired this jasper focal with white African opal, on a vintage chain, with a vintage clasp. This necklace measures 15”. If you have a neck any larger than 13”, this WILL NOT fit you. I am, however, happy to add a couple more beads if your heart is set on it!