of the handcrafted finishing details took 24 months: circular Côtes de Genève decoration, stippled main plate, bevelled and hand-drawn bridges as well as blued screws. Self-winding movement A new generation of self-winding mechanical movements was launched in 2006. The 800P, with hours, minutes, central seconds hands and large date display, is equipped with two barrels, guaranteeing a power reserve of 72 hours. This 12-ligne calibre, beats at 21,600 vibrations per hour (3 hertz) and its timing is ensured by a screw-regulated balance. The 850P version displays small seconds and a second time zone on two sub-dials. A day/night indicator synchronised with the central time zone completes the display. Art of enamelling Piaget continue the tradition of miniature painting thanks to a traditional technique. The enameller begins by crushing and cleaning raw enamels to obtain a very fine powder, which is then mixed with essential oils to achieve the colour palette. The enamel is applied with a brush in successive fine layers, each of which is oven-fired at temperatures exceeding 800 °C. Each enamelled piece requires nearly twenty firings in the oven. The enamel and its colours are then set forever. Setting and gemmology Piaget owns the largest jewellery workshop in Geneva. Every stone is cut, adjusted and set by hand. The diamonds meet the highest standards of colour (D to G) and clarity (IF to VVS.) The diamonds are tested according to in-house guidelines based on their colour, size, clarity and carat. Environmental rating In December 2018, World Wide Fund for Nature (WWF) released an official report giving environmental ratings for 15 major watch manufacturers and jewelers in Switzerland. Piaget was ranked No. 3 among the 15 manufacturers and, along with 3 other manufacturers including Vacheron Constantin and Jaeger-LeCoultre, was given an average environmental rating as "Upper Midfield", suggesting that the manufacturer has taken first actions addressing the impact of its manufacturing activities on the environment and climate change. According to Piaget's official document, the company is committed to "preserving natural resources and minimizing its environmental impact". In jewelry and watchmaking industry, there are concerns over the lack of transparency in manufacturing activities and the sourcing of precious raw materials such as gold, which is a major cause of environmental issues such as pollution, soil degradation and deforestation. The situation is especially serious in the developing countries which are top producers of gold, including China, Russia and South Africa. It