DiaMaster Grande Seconde It is amazing what can be achieved with Rado’s high-tech ceramics, a very light material that’s almost impossible to scratch and hypoallergenic. The highly resistant material is found on the case of this new DiaMaster. The width of the dial allows the two sub-dials to overlap with ease. We like the combination of Arabic numerals for the large seconds and markers for the hours and the minutes. The 43mm case in hightech ceramic houses an automatic mechanical movement.