Two main features will strike the observer when they first lay their eyes on the Tourbillon Bi-Axial Tantalum and Sapphire made by Girard-Perregaux: the bi-axial tourbillon and secondly, the darkened bridges made of sapphire which have undergone metallic black finishing. There is actually a third noticeable feature and that will the colour of the case which is made from tantalum. … More →