Cartier, Ballon Bleu, model: W2BB0011, automatic mechanical, stainless steel, diameter: 36.6 mm. The case is made of stainless steel and 18K rose gold interlaced gold. The distinctive rose gold crown guard on the side is set with synthetic spinel, which is one of the most recognizable features of the Ballon Bleu. The dial is made of natural white mother-of-pearl material, with a iridescent luster that changes with light. It is complemented by Roman numeral hour markers and blue steel hands, presenting an elegant and dynamic look. The interlaced gold bracelet is composed of alternating stainless steel and 18K rose gold, which is more luxurious than the all-steel model and more versatile and understated than the all-gold one.