Bracelet fastening system

A bracelet including two strands provided with a fastening system which includes at least one longitudinal groove on one of the two strands and at least one longitudinal protuberance on the other strand. The material and the shape of the groove and of the protuberance are configured such that these two elements interlock under pressure exerted by the bracelet user, over two overlapping portions of the bracelet strands. The connection between the strands can easily be separated, preferably by peeling the upper strand away from the lower strand. The bracelet is continuously adjustable in length, without requiring heavy or complex elements.