Is this chain solid gold or plated?

Both options exist: a 14k or 18k rose gold version and a rose gold plated version. Check which one you are buying, since plated chains wear differently from solid gold.

What length is it, and can it be worn with a pendant?

It is 16 inches, which sits at the collarbone. That length works well with a small pendant, but it is short for anyone who prefers a chain below the collarbone.

How does a figaro chain differ from a cable chain?

Figaro links alternate short round links with longer oval ones, so the chain has a repeating pattern and more texture. A cable chain uses uniform links and looks plainer.

Is 4mm too thick for everyday wear?

4mm is a mid-weight width: noticeable but not chunky. It suits daily wear for most people, though those who prefer fine, delicate chains may find it heavy-looking.

How should I care for a rose gold chain?

Keep it away from perfume, chlorine and lotion, and wipe it with a soft cloth after wear. Store it flat or hanging to avoid kinks in the figaro links.