...fwiw, I had my first house plastered by a local plasterer with white cement and white sand, way back in 1995, and I had a limestone chip added as well. It has never faded, and is a fraction of the price of monocouche, and there's 10 times as many people who can do it.
The only caveats are: white cement (Turkish, iirc...) which is a bit more than std, and the white sand has to be really good - I forget the property exactly, but I think it has to be silica-free ? Either way, a good plasterer should be able to tell you. If he can't, oops, move on to the next guy !