Is this chain solid gold or plated?

It is solid 14K rose gold throughout, not a plating over base metal. That means the color stays if it gets scratched, unlike plated chains.

What does 2.7mm width look like on?

At 2.7mm it is a medium-weight chain: visible on its own but slim enough to layer. It is thicker than a fine 1mm chain and lighter than a heavy men's curb.

Can I wear a pendant on it?

Yes. The curb links are interlocked and the chain is solid, so it can carry a pendant of moderate weight. Very heavy pendants may pull on the links.

How does rose gold compare with yellow gold?

Rose gold gets its pink tone from copper in the alloy, so it looks warmer and softer than yellow gold. It flatters most skin tones but mixes less easily with yellow-gold jewelry.

Is 18 inches a good length?

18 inches is the most common chain length and sits at the collarbone on most adults. It works under collars and layered with shorter chains.

How should I care for it?

Wipe it with a soft cloth after wear and keep it dry. Store it separately so the links don't tangle with other chains, and avoid chlorine and harsh cleaners.