The shiny gold gills don't seem to be that unusual in the UK. I've had many with shiny gills all from unrelated parents. The attachments I've added are of a juvenile we raised from a wild/leucistic cross, and the other is one we've had for a couple of years that came from a local pet-shop.
There was someone selling these on Ebay a couple of months ago as a 'rare new colour morph' for around £50 a pop. Even worse, people were paying it! Madness!