Puka shells originally were naturally occurring bead-like objects which can be found on some beaches in Hawaii. These were beachworn pieces of cone snail shells, a kind of seashell. Puka is the Hawaiian word for "hole" and refers to the naturally occurring hole in the middle of these rounded and worn shell fragments. These natural beads were made into necklaces.
--taken thru a glass souvenirs store window:)
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How did those puka shells turn blue? I grew up collecting puka shells on the beaches of my childhood home in Okinawa. But they were all off-white color. We strung them into necklaces and wore them, and the best ones were the ones that were more-or-less the same size or graduated.