Black Pearl

Black Pearl is a pearl used in various tradeskills.

Source
This item can be found inside Big-mouth Clams, Chests or simply drop from aquatic creatures.

Black Pearl as an Ingredient
Black Pearl is used in the following recipes:

Blacksmithing

 * Big Black Mace
 * Truesilver Breastplate

Enchanting

 * Runed Truesilver Rod

Leatherworking

 * Feathered Breastplate
 * Runic Leather Bracers
 * Shadowskin Gloves

Tailoring

 * Mooncloth Boots

Jewelcrafting

 * Figurine - Black Pearl Panther
 * Ruby Crown of Restoration