Everything old is new
s7e24 "The Dogs of War"
They're actually Pu'ah Kua shells from Rigel 7. They're shed by a creature that looks like a wrinkly cone snail and found on a beach that looks weirdly like Vasquez Rocks Natural Park outside LA.
/taps box
More proof of Deep Space 99.
... back?
Oh, come on. We all tried out different fashion trends when we were younger.
I'll admit to having had not only puka shells, but also a shark tooth necklace. Dark times.