The SIONA 2 Smartwatch Gold has a case diameter of 37 mm, not 42 mm. The model with a 42 mm diameter is not the same as the SIONA 2 in gold, but there is a smaller version with 37 mm, which is intended especially for petite wrists. The SIONA 2 in rose gold should also be 37 mm, as no 42 mm version is mentioned in the available information.