4x6mm – Approx 40 Beads Per 7.5″ Bracelet. 6x8mm – Approx 30 Beads Per 7.5″ Bracelet. Beads Shape: Rondelle Button. Material: Natural Fresh Water Pearl ( Not Treated or Dyed ). -Gemstone bead sizes are approximate and may have a +/- 0.5mm difference.