Necklaces tangle easily, especially during travel, and untangling them is frustrating. Pack them in cling wrap to keep each necklace separate and ready-to-wear once you arrive at your destination. Put down a layer of cling wrap, lay your necklaces out, then cover with another layer of cling wrap. Press the two layers together around your necklaces to keep them separated. Gently fold or roll your wrapped necklaces so that they create a small bundle that's easy to pack in your suitcase.
Less bulky necklaces, like pendants on chains, work best with this method. You can also pack bracelets this way, but buttons will work best for earrings. While the cling wrap will provide some protection, if your bundle has any particularly delicate jewellery in it, wrap clothing around the bundle for added padding.