Stainless steel necklaces, with a few in titanium. Lengths are on each product page.
Why steel. It does not tarnish, resists scratching, and several designs here are rated salt-water resistant. For a necklace worn every day and never taken off, that is a genuine advantage over precious metal.
Steel wire and CZ. Many pair a cubic zirconia pendant with a fine steel wire cable — the wire holds its shape without kinking the way a soft chain can.
Titanium. Lighter than steel and hypoallergenic, the option if other metals irritate your skin.
A few are plated. Some carry an IP or gold-tone finish over the steel — the product page names it.
See also Chisel bracelets, Chisel rings, Brilliant Ember necklaces and all Necklaces & Chains.