Lovely photos, Pattye!!
I took a shot of my little family of Turbo sarmaticus shells. The close-up is of the one I got first. I was on holiday in Fish Hoek, South Africa, way back in '88 and came across a little shop with shells. I had never seen these turban shells before and was charmed.
The hills and valleys in the shell are all on the inside of the shell-- outside, the surface is more or less smooth. It's an interesting optical illusion. The camera does not adequately capture the iridescence-- lots of pink and green.