Most layered necklaces use a lobster-claw clasp and include an extender or adjustable chain that lets you change the length by a couple of inches.
Common decorative accents include medallion pendants, small spherical or cylindrical hammered beads/links, and shaped metal charms (for example, emerald-shaped charms). These elements are often mixed across the different chains in a layered set.
Product listings vary: some show a recommended age of 6+, while others list a suggested age of 18 years and up.
Many listings show base chain lengths of about 14 to 18 inches, with adjustable extenders typically around 2 to 2.5 inches.
Layered necklace sets use a variety of chain styles, including paperclip, snake (flat or round), twisted rope, box, cable, curb, and alternating-link chains.