I just made a gorgeous 2 -tier sterling silver and Swarovski crystal necklace for a friend of mine. However, it's driving her nuts because the 2 pieces of chain somehow "roll" while she's wearing it and they get wrapped around one another. I just tried fixing it by attaching the shorter pieces to the larger strand by means of a jump ring, but it only made it worse. I don't know if the type of chain is just prone to "rolling" or if the situation might be helped by adding more weight (ie, more crystals.) Any suggestions?