here, you can see how the gold looks with different lighting.

the photo in the upper left was taken in the photo studio with special lighting.

the other 3 photos show etude hanging on a pale yellow wall. each shot is just a bit different perspective... at the same time of day.

you can see how the gold is affected by the lighting... just walking by changes it dramatically!

perhaps this will give you some idea as to how challenging it is to sort it out by shade. not only are there seemingly infinite shades, the lighting really complicates the process.