When I was a kid, there use to be a breakfast cereal in the United States called CoCo Puffs. It was the most god-awful chocolate flavored bits of chemical garbage that was a heart attack waiting to happen. There was this TV commercial that claimed, "Coco Puffs is an important part of this nutritious breakfast!" and it showed the bowl of Coco Puffs on a beautifully arranged breakfast table along with fruit juice, fresh cut strawberries, multi-grain toast, and a boiled egg.
Afraid yellow gold is suffering from a similar bias - in that it takes a six figure, hand-painted artistic masterpiece like a 5231 for the J to look decent.
Hence: Yellow gold=Coco Puffs