Uses
Artificial Pearls (sometimes written as just ArtPrls or AltPrls) serve much the same purpose as regular Pearls except that they're more powerful and always black and dark purple in color. They can be used by anyone and they know that this is the kind of Pearl Lunete uses.
Creation
They're made by Luna's Mistress and given to the Mermaids who aid her with the kidnappings. How exactly she creates them is unknown.
What an Artificial Pearl looks like.