A good chain bracelet has weight to it before it's even on your wrist. You pick it up off the dish by the front door and it pools into your palm with a proper clink, not a tinkle. The links sit close and don't flex about like cheap stuff does, and the clasp has a bit of resistance when you open it, like it actually means to hold. Cheap ones feel thin and loose and slide around in your hand before you've even tried the clasp.
Worn on its own it looks deliberate. Pile three delicate chains together and it starts looking like you emptied a jewellery box onto your arm without checking what matched, especially if the metals disagree, one warm gold tone next to something colder and silvery, they clash more than people expect two gold things to. A chunky chain bracelet next to a chunky watch on the same wrist is a fight neither wins, the watch loses legibility and the bracelet loses the chance to be noticed. I wear mine on the opposite wrist to my watch now, after a stretch of catching the clasp on the watch strap every single time I reached for my bag. Over months a decent one just gets smoother, the links wear in slightly and it starts sitting better against the bone of your wrist instead of swinging loose. The finish is the bit that tells you the truth about quality, a gold plated one will eventually show brassy patches at the links that touch your skin most, usually near the clasp, and no amount of polishing cloth brings that back properly. Solid metal, even a cheaper base metal, just dulls a bit and comes back with a proper clean. Take it off before you shower, before you swim, before you put hand cream on, that last one sounds fussy but cream sits in the links and goes grimy, I learned that one the slow way over about four months of a bracelet going from bright to murky without me noticing day to day.
It's the wrong choice if you work with your hands all day, it catches on zips, on gloves, on anything with a loop, and a chunky one on a desk job will tap the keyboard constantly, which gets old by about day three. It's also not the one to throw in the bottom of a gym bag loose, the clasp bends out of shape against other bits of metal and stops closing properly, I've had that happen and a jeweller fixed it but it was never quite as snug again.
When you're looking at one, check the clasp first, open and close it a few times, that's the part that fails before anything else does.