Teddy Baldassarre
Watch Jewels: What Do They Do and Why Do They Matter?
Those who are very new to appreciating watches may be surprised, and a bit confused, upon reading about a watch that boasts “21 jewels” and afterward looking it over and finding no diamonds or emeralds or any other precious stones on its dial or case. Many watches do, in fact, offer such adornments, but those are not what’s being referred to on a watch’s spec sheet in the “jewels” column; to clarify, “jewels” in horological parlance are not shorthand for “jewelry.” A watch’s jewels are, in fact, not even really intended to be seen and admired. Like the screws and gears and tiny wheels inside a watch’s movement, they are there to do a job, to play a vital and functional role in the smooth operation of a watch’s timekeeping. So what are jewels in a watch movement, anyway, and what are they for? And do watchmakers really use valuable, precious gems as workhorse components inside these micromechanical engines? On the latter question, well, yes and no. As to the former question, read on. The movement in a mechanical watch is a machine with lots of moving metal parts that tend to rub and grind against one another, creating friction that can wear down these components, adversely affecting the performance of the watch and ultimately shortening its functional life. The challenge in the early days of watchmaking was finding a substance harder than these metal parts to place at the vital pivot points to reduce metal-on-metal wear and tear. The answer pr...
