A snip at £2000. Each. If you want the Watch. So that’s £4000. But you do get a snazzy wooden presentation box to keep them both in.
Personally, I’d wear the watch and keep the iPhone in my pocket, or at least in my sight at all times (it’s bad enough dropping a regular iPhone down the toilet, never mind a gold plated one).
Could we laser engrave one of these? Technically, yes, but whether it would look any good is another question. If you are interested, we know a jewellery designer who does gold plating in her spare time. It would cost you a lot less than £2000, but you wouldn’t get the snazzy box.