SAN DIEGO (KSWB/KUSI) — Beachgoers in San Diego may have spotted some glistening, purple shells reminiscent of small gemstones in the sand recently.

Scientists at the University of California, San Diego's Scripps Institution of Oceanography have identified them as a rare species of sea snail called Janthina. They are known for their colorful, violet shells and their ability to float thanks to a natural "bubble........

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