I don't know the exact location, but I have managed to find it every year. It's down one of the little side alleyways off the main plazain the Old Port. Follow the alley and you will pass an entrance to a walled-in area with lots of little jewellery kiosks. The Crono Christophe Poly collection is not far from the entrance, across from a larger glass display case for another jewellery designer.
Other people asked questions on similar topics, check out the answers they received:
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them