Iridescent Pearl

Iridescent Pearl is a pearl commonly used in tradeskills.

Source
Iridescent Pearl are found inside the following clams:
 * Thick-Shelled Clam
 * Big-Mouth Clam

Blacksmithing

 * Iridescent Hammer
 * Shining Silver Breastplate

Enchanting

 * Runed Golden Rod

Leatherworking

 * Gem-Studded Leather Belt

Tailoring

 * Phoenix Gloves
 * Phoenix Pants
 * Spidersilk Boots