pearly trochidae

[dzeiden]

Hello folks,

Thanks for bearing with a total novice here. My daughter found this top shell on the beach on the Pacific coast of Costa Rica. From the little poking around I've done, I'm guessing it was a less-interesting looking top shell that has been worn away to its mother-of-pearl interior. I can even see some remnants of white exterior around the edges of the largest whorl. But the thing I can't find is an example with the beautiful, bright teal color, which is clear at the tip and at the lines between the whorls. It's as green as an emerald.

The picture is here, and you can click on it to enlarge it:
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Any ideas?

thanks for your help.
Debbie