The "Chartres blue" has incorporated the image of the blue color of the stained glasses in the Chartres Cathedral in France, which are said to be the most beautiful glasses in the world. The Chartres Cathedral is one of the three major cathedrals in France and was designated as a UNESCO World Heritage Site in 1979. The stained glasses that have a historic value are from the 11th to the 13th centuries and are known worldwide for their beauty. Particularly, the blue color, which is illuminated by light, expresses both deep and clear feelings and it is called "Chartres blue". The #3776 CENTURY CHARTRES BLUE fountain pen was made with the image of the sacred color.