From Pikipedia, the Pikmin wiki
The Princess Pearl (ヒメシンジュ?, lit.: "Princess Pearl") is a treasure found in Pikmin 2. The item can be found on sublevel 6 of the Cavern of Chaos, inside a Wollywog. This treasure could either be a bead from a pearl necklace, an earring, or a Christmas tree ornament.
“Salvaging this treasure was a dangerous and difficult task. I found it deep in the bowels of a dank, predator-infested cavern. My only hope of surviving was to strategically use all five colors of Pikmin.”
“This stone is for all the fathers who want their daughters to grow up to be elegant, rather than flashy. There is nothing cheap about the sparkle of this stone. It is the gift you have been looking for!”
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