Layering necklaces is a popular trend that allows you to create a unique and stylish look. To layer necklaces effectively, start with varying necklace lengths to create visual interest. Choose necklaces with different pendant shapes, textures, or materials to add dimension to your layers. Experiment with combining different styles and thicknesses of chains for a balanced and cohesive look. You can also mix metals or incorporate gemstone necklaces for added sparkle. Play around with different combinations until you achieve the desired layered effect.