34. Rolex. A fine 18K gold automatic calendar bracelet watch with lapis lazuli dial Model: Lady Datejust Reference: 6917 Date: Circa 1977 Movement: 28-jewel Cal.2030 automatic, adjusted to 5 positions and temperature Dial: Lapis lazuli, magnified date aperture at 3, gilt baton hands, centre seconds Case: Brushed and polished tonneau form, screw down back and crown, fluted bezel, No.5145835 Strap/Bracelet: Fitted 18K gold link Buckle/Clasp: Signed 18K gold folding clasp, stamped 5251 U10 Signed: Case, dial & movement Size: 25mm Weight: 56,96g Rolex has produced an interesting range of hard stone dials throughout the decades - malachite, tiger's eye, onyx and, as with the current lot, lapis lazuli spring to mind immediately. But even though the looks of these different stones can give a completely different feel to the design of a watch, there is one thing they all have in common. Hard stone dials are always a challenge to produce but do not change over time. Carved from a large stone which needs to be of excellent quality, the slice needs to be cut exceedingly thin in order to produce a usable dial. Especially with types of stone that are on the more porous side in structure, this can be a challenge and many are rejected. The complicated production process is clearly worth the effort. The nature of the material means each dial is truly unique and characterful.