The most classic and widely preferred pearl color is white. The white pearl is considered a symbol of purity, and is often associated with wedding and graduation celebrations. Pearls that grow with a natural white color include akoya pearls, freshwater pearls, South Sea pearls, and even occasional Tahitian pearls, which are most often dark. While white is a naturally occurring color in freshwater and akoya pearls, these types are routinely bleached to create an even whiter bodycolor, and then subjected to a treatment known as pinking. The latter treatment adds the slight rosé tone found in nearly all akoya pearls. These are universal treatments.