(Agatized Coral, From Vintage Collection)
"A Mermaids Coral'
This agatized coral was the property of a tyrant treasure-thieving-pirate by the name of Captain Warwick.
It was offered to him by a mermaid in trade for her release.
Upon taking the stone, Captain Warwick renigged on his agreement to release the mermaid instead choosing to take her to a village nearby in which to sell her.
Fortunately, the mermaid escaped into the waters of the Atlantic, but not before placing a spell on the stone. "To whomever retreves this stone from the horrible Captain Warwick, may they be forever protected whilst swimming in any waters".
She thereupon blew crushed dust (from the black pearls worn around her neck) into the stone, forever encasing it with protection for the wearer.
Which can only be seen when holding it up to the light.
(Story above is for entertainment purposes only)