It's quite difficult to get the real colour through pics on the website to be honest, that's why I'm so torn because if it leans more towards a plum shade I would probably pick the grey or the red over it
I personally thought the amaranth color looks more burgundy. It's a difficult shade to catch, but when I saw it in Vegas in the Lady Dior style my friend commented that it was a nice 'brown' color, as the lighting made it appear more red. Then in other lights it catches more purple and appears more plum. And in dark settings it almost black!