Gold loot is defined in 2 categories:
1) A special low stat gear set which doubles ur looted gold while wearing it.

2) Any gear with gold loot awakening.

Usually special gold loot set like avarice is too low in stats so it's not much good to play with it. and you maybe not have maximum gold loot awakening in your top gears, so u can switch to maximum gold loot awakening gears when u know u r about to have gold drops i.e. tresure rooms, boss killing etc.
Also some pets have gold loot effects.