Size S: Wrist Circumference: Approx. 6.3 - 6.7 inches (16 - 17 cm); Logo Engraving: Crystal 0.5 inches (12 mm); Blue Agate 0.4 inches (10.8 mm); Cut Glass 0.3 inches (8 mm); Rondell 0.3 inches (8 mm); *Due to the nature of the natural stone, there may be slight scratches or chips.