Sapphire case and bezel change the Sang Bleu from a colour-led watch into a study of its own geometry. The black disc-style dial remains the reading point, while the clear case lets the edges, screws and layers show through. The integrated black rubber strap gives the transparent case a defined boundary on the wrist.
The clear case also changes the way this reference sits with clothing. Against a dark sleeve the geometry becomes highly visible, while the black strap supplies a defined border.
The rose-gold and blue 648.OX.0151.RX.MXM24 Spirit of Big Bang Sang Bleu is the useful nearby choice: Rose-gold and blue Sang Bleu is a material-colour statement; sapphire makes the case geometry itself visible.
The transparent geometry makes this a conversation piece for a collector who enjoys unusual case work; dark sleeves give the sapphire structure the clearest outline.