Size M: Wrist Circumference: Approx. 6.7 - 7.1 inches (17 - 18 cm), Logo Engraving, Crystal 0.5 inches (12 mm), Onyx 0.4 inches (10.8 mm), Cut Glass 0.3 inches (8 mm), Rondell 0.3 inches (8,6 mm) *Due to the nature of the natural stones, there may be slight scratches