• Watch Crystals History Functionality and Stunning Timepieces
  • Crystal Clear Unveiling the Unsung Hero of Horology

    The Fascinating World of Watch Crystals from History to Noteworthy Timepieces

    Hourstriker Staff
    Words by: Hourstriker Staff
    July 24, 2023
  • As the curtain rises on the illustrious world of horology, let's set our gaze upon one of the unsung heroes of timepieces - the watch crystal. Don't be deceived by its seeming simplicity; the crystal is more than a shiny surface. It’s the protective lens through which we admire the complexity of the horological universe, guarding the artistry and engineering that tick away beneath it.

    Courtesy of Hublot
    Courtesy of Hublot


    Watch crystals come in all shapes and sizes, moulded to perfection to crown the dial and embrace the watch case. They're not made of actual "crystal," but rather robust materials such as plexiglass, mineral glass, or the extremely resilient synthetic sapphire. The choice of material is an exercise in balancing durability, cost, and visual clarity, each playing its part in the final appeal of the watch.

    When we delve into the annals of horology, we'll find that watch crystals have undergone a fascinating evolution. In the earliest timepieces from the 16th century, the crystals were made of thin slices of quartz or glass, and they often were the first part to succumb to wear and tear. In the 19th century, as pocket watches transitioned to wristwatches, there was a pressing need for a more robust covering that could withstand daily wear.

    Courtesy of Bell & Ross
    Courtesy of Bell & Ross


    Enter the era of plastic, or more specifically, acrylic crystals. By the mid-20th century, acrylic was a popular choice for many watch manufacturers. It was affordable, easy to produce and manipulate into various shapes, and more importantly, it was shatter-resistant. Despite being prone to scratches, these were easy to buff out, extending the lifespan of the watch crystal. Many iconic watches, such as the Omega Speedmaster and Rolex Submariner, sported acrylic crystals in their early models.

    But progress, as it is wont to do, marches on, and horologists yearned for something even better. In the late 20th century, mineral glass started gaining traction as a preferred material for watch crystals. More scratch-resistant than acrylic, mineral glass could be heat-treated or chemically hardened to produce a much tougher crystal known as 'Hardlex' or 'Mineral K1,' offering more resistance to breakage.

    The relentless quest for the perfect watch crystal eventually led to the advent of synthetic sapphire. Revered for its unmatched hardness, second only to diamond, and near perfect transparency, synthetic sapphire is today's gold standard for high-end watches. But, as we'll discover, even sapphire isn’t free from controversy and competition.

    From quartz to acrylic, from mineral glass to sapphire, the journey of the watch crystal echoes the larger journey of watchmaking itself. It's a tale of invention and reinvention, of craftsmanship and technology, of tradition and disruption. And it's far from over. There's much more to the story of watch crystals, and we'll explore it in the next part of our in-depth look, including four standout watches that exemplify the application and evolution of watch crystals.

    Courtesy of Richard Mille
    Courtesy of Richard Mille


    So, let's put on our horologist's loupe and prepare to peer deeper into the gleaming, shielding, and transformative world of watch crystals. Watch enthusiasts and budding horologists, buckle up for an enlightening ride into the under-appreciated art and science of protecting and showcasing the beauty of timekeeping.

    Continuing our exploration into the mesmerizing world of watch crystals, let's cast our eyes over four fascinating timepieces that exhibit the functionality and allure of their crystals in unique ways. These horological wonders not only highlight the integral role of watch crystals but also the boundless possibilities they present.

    Starting off our horological tour de force, we have the legendary Rolex Submariner. Known for its unwavering durability, the Submariner is encapsulated by a scratch-resistant synthetic sapphire crystal. This crystal is nearly as hard as a diamond, ensuring that your watch stays pristine through your deepest dives and toughest adventures. Coupled with Rolex's iconic Cyclops lens that magnifies the date window for easy reading, the crystal contributes immensely to the Submariner's prestige.

    Courtesy of Rolex
    Courtesy of Rolex


    Moving on, we visit the realm of aviation with the Breitling Navitimer. This iconic pilot's watch uses a cambered sapphire crystal that's glare-proofed on both sides. This treatment reduces light reflection significantly, making the busy Navitimer dial easy to read even under direct sunlight or in the cockpit. Breitling's strategic use of crystal enhances readability without compromising the watch's classic aesthetic, showcasing how a well-crafted crystal can elevate a watch's design and functionality.

    Courtesy of Breitling
    Courtesy of Breitling


    Next, we journey into the world of dress watches with the Patek Philippe Calatrava. This timepiece exemplifies elegance with its distinctly thin and almost invisible sapphire crystal, allowing an uninterrupted view of the beautifully simplistic dial. Patek Philippe's use of a sapphire crystal exemplifies its commitment to timeless beauty and lasting quality, underlining that a well-chosen crystal can contribute to a watch's overall appeal.

    Courtesy of Patek Philippe
    Courtesy of Patek Philippe


    Finally, let's turn back the hands of time with the Omega Speedmaster Moonwatch. Originally equipped with a Hesalite (acrylic) crystal to comply with NASA's stringent safety requirements, the Moonwatch continues to use this retro material in its classic model. While it might scratch more easily than sapphire, those scratches can be easily polished out, maintaining the watch's clear view of its historically rich dial. It's a compelling example of how the crystal isn't just a protective element but a conduit to a watch's heritage and story.

    Courtesy of Omega
    Courtesy of Omega


    In the course of our journey through these remarkable timepieces, it's clear that the watch crystal, though often overlooked, is an integral component of any timepiece. It is the guardian of the dial, the window into the intricate mechanics of timekeeping, and a contributor to a watch's aesthetic appeal and functionality.

    As we conclude, let's not forget that the watch crystal is more than just a piece of glass or synthetic material. It's a testament to centuries of horological evolution, marrying technology with artistry, durability with elegance. It silently does its duty, allowing us to admire the wonders that lay beneath it, while standing as a symbol of the enduring quest for perfection in watchmaking. Whether you're a watch aficionado or a casual admirer, let the humble watch crystal remind you of the marvel that is a timepiece – a stunning synergy of art, science, history, and craftsmanship. The next time you glance at a watch, take a moment to appreciate the crystal. After all, without it, we'd be unable to marvel at the dance of gears and hands that so mesmerize us.
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