I definitely agree about seeing real sample for color, especially in regard to something so variable and subtle as rose gold. Displaying the color as it's displayed is pretty meaningless, since a color code means nothing unless it's been selected by someone using a calibrated monitor and then viewed by someone who also has a calibrated monitor. Otherwise, it's just data that every monitor will pretty much display differently.
If the colors are the same as other KBDFans keyboards, then that reference is fine, but there's no indication of this. Besides, I've seen something like purple anodization look very different on different KBDFans keyboards. And, as far as rose gold goes, there isn't any other KBDFans KB to use as reference anyway, as far as I know.
I realize it's early in the GB, but, if I decide on rose gold, for example, I'd need to see something more accurate before joining. Of course, the same thing about color calibration goes for a photo, but at least it represents an anodized surface batter than a color code does.