Quartz Watches & Clocks: How They Work

cazalea · 2026-03-16T15:32:33Z

Cazalea explains how quartz watches work, from piezoelectricity to the 32768 Hz frequency. Explore the science behind quartz accuracy and its horological impact.

cazalea

WPS member · Horological Meandering forum

15 replies721 views4 photos

Cazalea, a respected member of the WatchProSite community, delves into the fundamental science behind quartz timekeeping. His original post meticulously explains the piezoelectric effect and the precise mechanics that allow quartz crystals to achieve remarkable accuracy. This exploration is crucial for understanding a technology that revolutionized horology and continues to underpin many modern timepieces.

15 collectors discussing this on the WatchProSite forumJoin the Conversation →

Chemically, quartz is a specific form of a compound called silicon dioxide. Quartz is a piezoelectric material: that is, when a quartz crystal is subject to mechanical stress, such as bending, it accumulates an electrical charge across some of its planes as the molecules slide against each other. For example, crystals were used in low-end phonograph (record player) cartridges: The movement of the stylus (needle) flexes a quartz crystal, which produces a small voltage, which is amplified and played through speakers. The reverse effect, also holds true; if an electrical charge is fed into across the crystal, it will bend.

A Quartz Crystal is generally used as the frequency determining device in a watch. When a voltage source is applied to a specially-trimmed, thin piece of quartz crystal, it begins to change shape producing a piezoelectric effect. When the physical size and thickness of a piece of quartz crystal is tightly controlled and fed an electrical current, we make it produce specific vibrations, known as the crystals “characteristic frequency”. Once cut and shaped, the crystal only operates at that frequency; its size and shape determine its constant output.

For watches, 32768 is the normally-used frequency. Why? Because 32768= 2¹⁵ (32768 divided by 2, 15 times) equals one pulse per second. A small circuit does the dividing work, and the resulting pulse moves a tiny motor which moves the second hand, and through a train of gears, the minute and hour hands.

The Chronomaster shown here is accurate to +/- 5 seconds per year.

If you really want to learn more, this Wikipedia Article will help you (or put you to sleep)...

Quartz watches can be very cheap and produced by the millions:

or quite expensive and used for a reference on marine voyages (independent of land or air signals)

The crystal is in the vertical metal case.

Cheers,

Cazalea

Key Points from the Discussion

The 'Black Box' effect in quartz watches, where the internal mechanism is less visible and seemingly less understandable than in mechanical watches, contributes to a perceived disconnect for some enthusiasts.
The Q factor, a measure of an oscillator's efficiency, highlights the superior energy storage and return of a quartz oscillator (around 1,000,000) compared to a mechanical balance (around 1,000).
Despite its age, quartz technology represents one of the last significant innovations in the watch world, with some modern quartz watches achieving impressive accuracy, such as +/- 7 seconds per year.
The star on the dial of certain quartz watches, like the Chronomaster, signifies a high-accuracy crystal movement, often accompanied by precise second hand alignment.
Some collectors are reconsidering quartz watches for their convenience, accuracy, and the ability to enjoy a luxury brand without the complexities of a mechanical movement.
While low-end phonograph cartridges utilize the piezoelectric effect of quartz, high-end cartridges often employ moving magnet or moving coil designs, which require an external power supply and coils to create a magnetic field.

The Discussion

Gregineugene

Mar 16, 2026

I think part of the disconnect that quartz watches suffer is that they have the "Black Box" effect whereas mechanical watches allow us to see and (at least pretend to) understand the mechanism and its effects.

quattro

Mar 16, 2026

I didn't know that the same “mechanism” or reaction was used on low-end phonograph cartridges: just out of curiosity, what other “mechanism” is used on high-end phonograph cartridges? Best, Emmanuel

Thomas_3

Mar 16, 2026

many, many years but am seriously considering jumping back in with my next watch purchase. Strongly thinking about the Cartier tank watch in quartz, A. never need to wind/set B. Just want to try a quartz watch again. C. No one will be the wiser, and D. It's my money and I can do with it what I want.

Gregineugene

Mar 16, 2026

www.crutchfield.com

KMII

Mar 16, 2026

But frankly it’s been practically the last real innovation in the watch world, albeit around 100 years old itself 😂 I often enjoy a nicely done quartz watch, even though those are few and far between 😊👍🏻 Doesn’t quite manage the 5 seconds a year on the current battery but easily gets within +7 - which is mightily impressive 🦾

cazalea

Mar 16, 2026

that version needs a small external power supply and the coils shown in Greg's post, to create a magnetic field through which the magnet moves

Continue the conversation

This thread is active on the Horological Meandering forum with 15 replies. Share your knowledge with fellow collectors.

Join the Discussion →

Key Points from the Discussion

Continue the conversation

More from this Forum