Starball I didn't know it was a fashion thing? I've never worn 'yellow' gold because it doesn't suit my olive skin tone.
When I was younger/before I was married I used to wear/buy/ask for silver jewellery, and when I got married I had a platinum wedding ring. I would have thought if you liked 'yellow' gold enough to get a gold wedding ring in the first place, you'd always like it...
I think yellow gold looks fine on the right skin tone, just not mine. So actually, I don't get it either. And anyway, gold is yellow, full stop. Any other colour just means it's been plated or alloyed with another metal which isn't gold at all - which is why 'white gold' often turns yellow in the end anyway.
So as I don't like the colour of gold, I either have silver or platinum jewellery.