Size M: Wrist Circumference: Approx. 6.7 - 7.1 inches (17 - 18 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 and chips.