The Enameler introduces colour either by using colored glass or by including pigments into the glass before firing. After the glass melts and flows, it cools into a hard, sleek coating more than the substrate. Encapsulating this Charming dial can be a 38mm 18K yellow gold situation with 10.7mm thickness, https://www.watchesworld.com/exploring-the-aesthetics-of-dial-design-and-decoration/