So I was like you, undecided. I am olive tan Asian (medium dark skin) and carnelian doesn’t look good on me; it could’ve been the type of red as there are variations but it didn’t look right. I also tried MOP which I was CERTAIN would look good and honestly I wasn’t totally underwhelmed. It was beautiful to look at but on my skin for some reason it looked flesh tone and I am not pale so it shouldn’t have looked like that. I tried several and I think it’s due to the high iridescence which is beautiful and very desirable but on my skin, it didn’t stand out and wasn’t very striking.
Here’s the clencher: for the fun of it I tried onyx and oh my, this was gorgeous even on my olive skin. It was dark and bold and stood out. I was shocked because I was convinced the onyx would make me look darker but instead it made my features stand out more!
I am still undecided and even though I know onyx looks better on me, I really still want to get the MOP even though I’ve tried it multiple times and it doesn’t really look that good.
Moral of the story: go try them on and bring a friend to give you honest feedback and take lots of selfies so you can analyze further at home lol