How to Determine a Pearl's Value A girl's best friend "Pearl" is the gemstone of serenity. It is an aquatic jewel holding a value known to few people. Determining the worth of a pearl is an art and not many people have mastered this art. Being an exceptional gem, there are certain measuring standards to label the degree of a pearl's paucity and value, be it uncultured or Cultured, which includes size, shape, imperfection, and gloss.