I don't know what kind of shell this is but I brought it with me from North Stradbroke Island, Australia.
As my camera can't focus in low light I first focussed with the light on. After that I turned the light off and used a small LED to bring some light to the shell. I played a little around with the framing and the LED and decided that this one was the best of all the pictures that I took. In PS I changed the colour of the shell from green to a more reddish tint.
I used a wide angle lens and two close-up lenses for the magnification and of course a tripod.
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Perfect framing and forepart equilibrating very well the image. Sharp and well exposed, but I would have left the natural colors, where,I suppose, pearl shades would have been apparent.
Interesting lighting - my first thought was "what's that slash of light pink at the bottom" - it took me some moments to realise it was light coming from inside the shell opening.
Hehe, i had the same project for this challenge (background was white instead), and made same colorizing. Did'nt post it finally . Your shell pic is nicely done.