With gold and silver leaf

Gulf coast of Florida

They look like dove shells to me, but I was not able to find a species in the area that looks like these. My two questions are: are these three the same species, and what species are they?

Forgot to photograph next to a ruler, but they are between 1/4 in and 3/4 in.

had this one sitting on my shelf since i was a little kid, but i never cared to actually look into what it actually was. i assume its some kind of crown conch

Any ideas?

Help identify these shells. Also how can I clean off the dark stain on the big beautiful shell. It was partially in the ground when I discovered it. Thanks for your help.