What color assosiates with royalty or spirituality?

It was originally more of a red color, a deep crimson. The dye was quite expensive, being derived from a species of sea snail in the region of ancient Phoenicia, and only the very rich could afford it. As a result, it became associated with people at the very top of the socio-economic ranks. Over time, the preferred shade became the one we know as purple today, but the name was kept, owing to its royal associations.