Casting as in metal casting. Enamel as in "vitreous enamel" or "jewelry enamel." The term "enamel" has been largely debased by general use of any fired ceramic glaze (or in the case of "enamel paint" by anything vaguely hard and shiny) but good'n'proper enamel is ground glass fired to molten temperatures. In archetypal, respectable jewelry, it is always done over pure silver or gold. The artists most responsible for extending the art are all from the Art Nouveau period, notably Henri Vever, Rene Lalique and Peter Carl Faberge. Enameling itself has suffered mightily as the translucent, heavy metal enamels used in its creation are difficult to acquire compared to the garbage generally used. Not only that but wretched mass-production techniques have dissolved much of the market for actual jewelry enamel. But it's fun, it's easy, it's rewarding, it's meditative and it's repeatable. This took three hours.
Oh, I'm sellin' just not yet. I had a watch I liked a bunch, and then the new model sucked. And I have a job that let me surf the Internet a lot, so I got interested in clocks. Then I discovered that building your own clock is something old men do and nobody pays you for, but then i found out that there was a clock repair class nearby, but that they recommended the watch repair class first, at which point i discovered that one of the five watchmaking schools in the world was two exits from my house, and then things snowballed. I made jewelry before I went to college and then I went to college for mechanical engineering. Frankly if all of my jewelry-making stuff hadn't gotten stolen by Averats my junior year I probably would have been a watchmaker 20 years ago.