Is there a better combination than Rados plasma high-tech ceramic and a breathtaking open work dial? Looking at the Rado Dia Master Open Heart Automatic watch, we think not. Described as a perfect example of Modern Alchemy, Rados plasma high-tech ceramic offers all the same benefits as classic ceramic, including scratch resistance, lightness and hypoallergenic properties, but also offers an incredibly high shine so that is almost glistens like a diamond. The case of this Rado Diamaster watch is engineered entirely from plasma ceramic, sitting on the wrist at 35 millimetre in diameter, 10. 5 millimetre in height and secures comfortably to the wrist by a black alligator leather strap.