Watch Shopping for Information: All About Watch Crystals

893 shares, 61 points
Watch Shopping for Information: All About Watch Crystals
Rolex Oyster Perpetual Milgauss
Picture: Rolex

Amidst the festive feastings on the finish of 2021, we put out a decorated dial buying guide that felt applicable for the season; Yuletide decors paired with ornate(ish) watch dials. Subtracting the glitz and glamour, this subsequent instalment pales as compared as we spotlight the watch dial’s brother-in-arms — the watch crystal. Observe that the rationale we use that time period is that one of many major functions of the dial is to guard the motion from damages coming from the entrance; the crystal has an analogous activity, solely that it gives an extra layer of safety by defending the dial too. Consider it as clear armour.

Whereas the issues for watch crystals are pretty simple, their significance can’t be understated as they kind some of the essential elements of a watch to make sure mud and water-resistance — after all, in addition they permit wristwatches to be functionally helpful, however that ought to go with out saying (maybe H. Moser & Cie want to troll us by making a watch and not using a crystal – Ed).

Now, watch crystals are regularly ignored as a topic as a result of we actually spend our time trying proper by way of them. However, when your watch meets a tough floor, it’s most likely the crystal that takes the brunt of the blow. It additionally has the potential to vary how the entire watch seems to be and even feels. As such, this information will turn out to be useful for brand spanking new watch consumers although it may be a very good refresher for seasoned collectors too.

One in every of NASA’s necessities for Omega was that the crystal of the Speedmaster Moonwatch needed to be shatter-proof to make sure the security of their astronauts. Picture: Omega

Three Amigos

Throughout the myriad of watches accessible out there, there are three major supplies that watch manufactures work with for crystals: acrylic, mineral and sapphire. Okay, solely a kind of qualifies as a crystal however we don’t make the foundations on nomenclature (glass shouldn’t be a crystal, for instance)! These are the most typical names although there are others coined within the trade reminiscent of hesalite or plexiglass used interchangeably with acrylic, and hardened glass used instead of mineral crystals. Relying on the manufacture’s profile, a watch’s specs or aesthetics, certainly one of these three supplies might be chosen. Given the totally different properties of the supplies, every has its professionals and cons which interprets into strengths and weaknesses.

Associates with the Pockets?

Worth is one consideration because the crystal materials alternative will add to the underside line of the watch. Most of the time, watch manufactures don’t supply watch crystals as a customisable possibility, however our level might be illustrated by way of the distinction between a closed or exhibition case again. Nomos Glashütte famously presents each closed and exhibition caseback choices with, as you may count on, an added premium starting from $380 to $520 after a fast verify on a number of fashions. Whether or not or not you are feeling the pinch through the buying section, the price of changing crystals could be a impolite awakening throughout servicing journeys…

One of many challenges of manufacturing crystals is guaranteeing excessive ranges of structural integrity, particularly for these with odd shapes such because the one fitted on the Bell & Ross BR 01 Cyber Cranium Sapphire. Picture: Bell & Ross

Acrylic, which has been used as a watch crystal materials because the Twenties, is actually a chunk of plastic, making this cheap to work with. Typically clear and thermosetting in nature, acrylic crystals are simply moulded and formed with warmth earlier than being solidified into the specified kind. Then again, sapphire crystals (artificial in nature) sit on the dear finish of the spectrum and are comprised of aluminium oxide. These oxides are heated to extraordinarily excessive temperatures earlier than being forged into blocks below excessive strain. Items of disks are then sliced into desired shapes and polished with devoted diamond-tipped equipment. Mineral crystals are comprised of glass and are priced comfortably between acrylic and sapphire crystals.

Coping with Injury

Nothing feels worse than damaging your watch. Sadly, the odd knock or two is inevitable, irrespective of how cautious we’re with our watches. Some are reasonably innocuous whereas others, not a lot. Scratches, starting from barely seen hairline ones to deep ones, are some of the widespread indicators of damage discovered on watch crystals. Don’t low cost the chance of a shatter both, as relying on the crystal’s bodily properties, there are slight probabilities of it taking place.

A cloth’s hardness will decide its resistance to scratches. Between acrylic, mineral and sapphire crystals, the latter ranks the very best with a score of 9 upon 10 on the Mohs scale making them just about unscratchable. Solely diamonds are tougher than sapphire, which explains why diamond-tipped equipment is required to work this materials. Acrylic and mineral glass register three and 6 on the Mohs scale respectively, making them extra inclined to scratches. Unintended knocks may end up in scuffs and even deeper scratches.

Longines Heritage Military Marine Nationale
The Longines ref. 5774 made for the French Navy in 1947 encompasses a field acrylic crystal that resists shattering in perilous environments. Picture: Longines

Right here comes the attention-grabbing caveat — the fabric’s hardness acts as a double-edged sword of types. Given how simply acrylic or mineral crystals scratch, eradicating them is comparatively simple with the assistance of sharpening compounds. Ought to the injury be past salvage, a alternative is unlikely to burn too large a gap within the pocket. Conversely, since it’s virtually not possible to scratch sapphire crystals, eradicating scratches is simply as troublesome; sadly changing the crystal is the one viable possibility, and is commonly accompanied by an eye-watering price ticket.

Shatters are the worst-case situation because it means the crystal has been subjected to excessive affect. Homeowners of sapphire crystal topped watches might be most displeased to study that the probabilities of them shattering, whereas comparatively low, are larger than that of acrylic. Sapphire’s hexagonal crystal construction is organized in such an orientation that makes it brittle. Any type of stress may end up in cracks or shattering — cracked cell phone screens are a very good instance. Mineral crystals exhibit related traits with sapphire crystals whereas acrylic ones are virtually shatterproof, which explains why Omega outfitted the Speedmaster with hesalite as NASA can’t afford to have shards of glass floating in area vessels.

Coated or Not?

The Panerai Radiomir S.L.C. 3 Days PAM449 encompasses a plexiglass crystal and comes with a spare alternative plexiglass crystal that have to be put in by Panerai. Picture: Panerai

Reflections on a watch crystal have an effect on legibility. Harsh lighting or daylight impedes time telling when watches are learn at sure angles. A easy treatment to that is an antireflective coating (AR-coating), a standard time period listed in tandem with sapphire or mineral crystals when going by way of watch specs. Given each supplies are usually reflective in nature, making use of a number of layers of AR-coating (prime, backside or each) negates reflections. Acrylics are naturally UV resistant and don’t require such coatings. Similar to the glasses or digicam lenses with the identical specs, the thought is to truly permit extra mild to filter by way of, reasonably than bounce off.

The form of the crystals can have an effect on their legibility too. Distortions are a standard incidence when peering by way of boxed crystals from an angle whereas dive watches are often paired with flat crystals as domed ones go clean when considered underwater. Some watchmakers supply “double-domed” sapphire crystals (each outer and inside surfaces are curved) to supply a clearer view of the dial.


With the arrival of high-tech supplies reminiscent of sapphire or ceramics, elements original out of these supplies are capable of stay in as-they-are-condition a long time down the street. Probabilities of discolouration or oxidation (patina as they’re affably referred to as in watch terminology) taking place are diminished to zero p.c, permitting them to stay in pristine situation indefinitely. Acrylic and mineral crystals run the chance of weathering as extended publicity to daylight may cause them to show yellow. An enormous shout out goes out to the Rolex Oyster Perpetual Milgauss and its inimitable inexperienced sapphire crystal. Whereas colored sapphire watch instances are gaining traction amongst watchmakers, they don’t share the identical enthusiasm for colored sapphire crystals in the intervening time. Maybe an emphasis on legibility is holding them again however this might very properly be the development for watches.

Vanguard Revolution 3 Skeleton
The dome crystal of the Franck Muller Vanguard Revolution 3 Skeleton requires ample clearance to accommodate its triple axis tourbillon. Picture: Franck Muller

A crystal’s form influences a watch’s aesthetics too. Domed crystals reminiscent of these seen on Franck Muller have a magical magnificence whereas boxed crystals add visible curiosity and have a classic appeal to them. The latter is very well-liked with the rise of neo-vintage watches such because the Tudor Black Bay Fifty-Eight that utilise it to nice impact. Lately because it provides visible curiosity to the watch. Since elevating the crystal makes it extra susceptible to scratching, having a boxed crystal made with sapphire is essentially the most fascinating possibility.

Debunking Myths

Tudor Blackbay Fifty-Eight 18k gold
Given the classic cues of the Black Bay Fifty-Eight, having a field crystal accentuates it much more. Picture: Tudor

Having labored in watch retail for barely over three years, I’ve come throughout my fair proportion of consumers who faucet a watch crystal to determine its materials. They consider that sure frequencies, readability and crispness of the sounds are linked to a selected crystal. Whereas some get fortunate with their guesses, this isn’t an correct technique because the thickness and form of the crystal can have an effect on the way in which it sounds when tapped. That is virtually as foolish as operating a knife blade throughout your watch crystal to verify its materials nature.

For extra watch reads, click on here.

Like it? Share with your friends!

893 shares, 61 points


Your email address will not be published.