The pearl rosary represents salvation. It is also associated with the joy of discovering what was previously hidden. Pearl rosaries are not only lustrous to the eye and to the touch but are filled with Catholic symbolism too!
A pearl bead is very versatile as it combines well with both silver and goldtone accents. The smooth feel of the bead also makes for an enjoyable prayer experience as you say each of the rosary prayers and the beads glide between your fingertips.
We can find reference to the pearl in Matthew 13:45 The Kingdom of Heaven is like unto a merchant man, seeking goodly pearls; who, when he had found one pearl of great price, went and sold all that he had, and bought it.