Calliostoma zizyphinum

[poseidon]

well, both of your shells are not calliostoma but gibbula. concerning the "green" shells I didn't see well but anyway please check the below diagnostic character :
if the base of shell is concave = gibbula rarilineata
if the base is convex = gibbula divaricata

regarding the "brown" I can just say that for sure is not calliostoma but gibbula. but the shells is very poor ( beached I suppose) to determine exactly the specie.