Calla Lily is a deep browned rose, with reddish undertones. It's not quite in the red spectrum in my opinion, but it's darker and noticeably warmer than most of the other deep shades in this formula (apart from Ceylon, which is definitely brown). Violetta is a blue-based, raspberry pink. I bought Calla Lily, which gives me a slightly sepia-toned rosy lip when worn. The Lip Chic formula is one of the easiest and most comfortable to wear on my naturally very dry lips.
Picture applied (please bear in mind my lips are a pale mauve naturally, and Lip Chics are quite sheer. On a person who does not have corpse lips, this colour may appear darker and warmer).
Edit: I had mixed up my right and left. Thanks to Klara for spotting this. Now corrected. Swatched, Bourbon Rose Lip Chic on the left for comparison, Calla Lily on the right. Calla Lily is deeper and warmer, with brown tones that Bourbon Rose does not have.
In context of the rest of my face. This isn't a great photo (and you should have seen it before I cropped it) but it shows the colour and tone of the lipstick against my skin well. The dark and slightly sepia rose gives a nod to an autumnal gothic lip look, without being as lip-diminishing as a dark, opaque colour can be.