Cloth of gold - pretty, tiny and very dangerous

Travelling in Australia, my daughter and I visited a small cay called Green Island enroute to the Great Barrier Reef. On the sandy beach, I picked up some bits of coral and tiny shells and and put them in Yasemin's hand.

At once, she identified the conical shell on the left. "A cloth of gold."

"Do you remember playing with Alvina's shell collection when you were little?"

"Of course. And that one nearly killed her."