The first thing I do with a gold plated bracelet is run a thumbnail along the inside edge, where it would touch a desk or a sink. That's where the plating gives up first, and if there's any green tinge waiting to happen, you'll feel a seam or a rough patch before you ever see it. A good one feels smooth all the way round, like it was finished rather than just dipped and dried.
It's the sort of thing that works harder than you'd expect once it's actually on your wrist rather than sitting in a drawer. A plain bangle sits under a jumper sleeve without snagging the wool, a chain link one looks right against a plain cotton shirt, and a stack of two or three thin ones does more for a bare arm in summer than a single statement piece ever has for me. I wear mine with the sort of clothes that don't ask for permission, jeans, plain tops, nothing with a lot going on, because the bracelet is the detail and it stops being one if everything else is shouting too.
Here's where the cheap and the good ones really part company, though. The bad one looks identical to the good one for about three weeks, then the colour starts going thin at the clasp and at any point it rubs against another piece of jewellery, and underneath is a flat yellowish metal that makes the whole thing look tired rather than just worn. A better plated piece, thicker gold, properly bonded, will dull slightly over months rather than patch, and a jewellery cloth brings most of that shine straight back. Keep it away from perfume and hand cream if you can, take it off before a shower if you want it to last, and don't let it sit tangled with other pieces in a dish where the clasps can scratch at the plating. None of that is difficult, it's just the difference between a bracelet that's still decent at Christmas and one that's gone patchy by October.
On colour, I'd go for a warmer, slightly antique gold over anything too bright and yellow, it ages better and looks less like costume jewellery when the shine does eventually soften. Rose gold plating wears well too, and hides any dulling better than a cool, pale gold does.
This is for anyone who wants gold on all day, every day, without worrying about losing something expensive down a drain.