Size S: Wrist Circumference: Approx. 6.3 - 6.7 inches (16 - 17 cm), Logo Engraving, Crystal, 0.5 inches (12 mm), Magnesite 0.4 inches (10 mm), Cut Glass 0.4 inches (10 mm), Rondell 0.3 inches (8 mm) *Due to the nature of the natural stones,