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Conus granulatus
Photo take at -30 ft near a coral reef first time i see this shell small about 2 cm long looks like a cone shell ??
This is 100% certainly Conus (Atlanticonus) granulatus or the Glory-of-the-Atlantic Cone. They have a strong population in this area of Mexico and this is a fantastic specimen!
Here's the image that led me to that ID:
http://www.jaxshells.org/granulat.htm
Thanks Blogie :) but it look that the range is only for the south pacific more like where you are, but it most be the same family or species .
I'm not 100% sure, but it could be Conus sulcocastaneus.
http://eol.org/pages/4821699/overview