10K yellow gold chains, solid and stamped 10K. Ten karat is a harder alloy than 14K — it holds up better to daily knocks and costs less for the same link and length.
Rope and figaro. Rope chains are the largest group; the twist hides wear better than any flat link. Figaro alternates one long link with three short and reads as more decorative.
Flat and square. Curb chains lie flat against the skin. Box chains are square-linked and hang straight under a shirt.
Classic links. Cable, anchor with a bar across each link, wheat braided from four strands, and Singapore.
Carded. Carded chains come ready-packaged for gifting.
10K or 14K? 10K is 41.7% gold and 14K is 58.3%. 10K is paler, harder and cheaper; 14K is richer in colour and softer. For a chain worn every day, 10K is the practical choice.
See also 10K white gold chains and 14K yellow gold chains.