Large Hole pearls have a 2.5mm inside diameter, the drill holes are produced with a 5 step drill process to insure a cleanly drilled hole without abrasion to the nacre and the drill hole is a consistent diameter through the pearl. Pearls in White, Off White, Cream, Pink, Peach, & Silver are natural & undyed. Pearl hues of Chocolate, Wine, Green, Purple, Gold and others are dyed per our custom specifications.