The method you choose for how to get a necklace untangled will depend on the size and material of the piece. For larger chains that get tangled, you may find that a quick soak in a solution of warm water and soap is enough to help you loosen the knot with your fingers. For tangles on more delicate chains and particularly challenging knots, you may need to use a straight pin or a sewing needle to carefully loosen the knot to a certain point before continuing to untangle the piece with your fingers.