Signum Cero Bronze Green Copper Turquoise dial, the dial is made the stone called Green Copper Turquoise. A lot of work has gone into producing these dials from stone selection to cutting and dials preparation to bring out the color. Each dial is completely unique therefore there will be variations in the amount of copper in the dial and also it’s composition as no two dials are the same, we have no influence on its appearance as its a natural material. Furthermore the watch case is made of CuSn8 bronze and will start to develop patina within a short time which is completely natural and we have no control over this as its how the metal reacts with other natural elements in the air, this is by no means a fault but gives the watch even more unique character. 
You have a choice of two case sizes 39.5mm and 42.5mm with a choice of date or no date window, those who choose to have a date the date discs are also lumed. The Cero is powered by the very reliable Japanese Seiko NH35 (date) and NH38 (no date) Automatic movement.