A little bit about the enamelling process:
Contemporary enamel jewellery. The enamels are ground to a fine powder under water in a pestle and mortar. They are then applied to the silver and fired in a kiln to fuse the enamel to the metal. On most pieces he surface is then "stoned back" so the enamel is flush with the silver and any pits and holes repaired before refiring, each piece may be fired several times to achieve the requiried results. The silver is often oxidised to give it a dark appearance that contrasts well with the vibrancy of the enamel.