Common lengths run from about 11.5 inches up to 18 inches. Many pieces include adjustable extenders of roughly 2 to 3 inches (examples: 2", 2.5", and 3" extenders).
Most use a lobster-style clasp (listed as 'lobster claw' or 'lobster-claw clasp'). Some items attach an extender chain to that clasp for easy adjustment.
Most are described with gold plating or gold-tone finishes, including mentions of 14K or 18K gold plating, multi-layer plating processes, or high-polish gold-tone surfaces.
There are multi-chain layered pieces and pre-stacked sets that combine chokers, pearl cords, and longer pendant chains to create a layered look in a single item.
Many listings state they are hypoallergenic or note nickel-free/lead-free construction. Several descriptions also mention hypoallergenic copper or stainless-steel bases and tests for nickel compliance.
Many necklaces include 2–2.5 inch extenders or are offered in multiple length options (examples show 14/16/18 lengths with a +2" extender). One listing specifically notes a 3-inch extender. Exact adjustability varies by item.
Chain styles include link/cable, snake, paperclip, rope/twisted rope, box, and curb-style chains, plus alternating or decorative link variations used in layered pieces.