Its mechanical heart is a precise solar-powered movement that is resistant to shocks. The watch case is made of durable stainless steel in black.The bracelet is made of high-quality stainless steel. It can be easily taken off thanks to a comfortable clasp. The black dial features a mineral crystal, which is very resistant to impacts and scratches that are caused during daily use. Due to a water resistance of 200 meters, the watch can be worn during swimming and freediving at greater depths. Casio G-SHOCK GST-B100D-1AER is an authentic watch that you can purchase in our authorised store. The model is packed in a branded box and comes with a manufacturer's warranty.
Functions
Bluetooth® Smart
The watch is equipped with energy-saving Bluetooth® technology, which offers power-saving data transfer at the push of a button. The watch can connect to a smartphone wirelessly via Bluetooth®, enabling access to a wide range of useful functions.
LED light
A light-emitting diode (LED) is used to illuminate the watch face.
Shock-resistant
Shock-resistant construction protects against impact and vibration.
Vibration-resistant
AlphaGEL elements surround the watch, making it even more resistant to shocks and vibrations. AlphaGEL is a silicone material. It is extremely flexible and has a cushioning effect on the module.
Solar Power
A solar cell provides power for operation.
Neo-display
A luminous coating provides long-term illumination in the dark after only a short exposure to light.
World time function
Displays the current time in major cities and specific areas around the world.
Dual Time Display
Dual Time simultaneously displays the time in two different time zones.
Date and weekday display
The current day and weekday are both displayed.
Stopwatch function - 24 hours
Elapsed times are measures with split-second accuracy. The watch can measure times of up to 24 hours.
Timer - 1/1 sec. - 24 hours
For fans of precision: the countdown timers help you to remember specific or recurring events by giving off an audible signal at a preset time. They The time can be set to the nearest second and up to 24 hours in advance.
Daily alarm
The daily alarm reminds you of events that recur every day, by emitting an audible signal at the set time.
Crown button lock
Secures the crown button from accidental change to another mode of operation.
Smart Access Technology
Smart Access makes it easy to operate CASIO’s watches. Pulling out and rotating the crown provides intuitive control over various functions.
Phone Finder
Misplaced your smartphone? All it takes is the push of a button on your watch and the smartphone sounds an alarm.
Automatic calendar with Date, Day and Month
Once set, the automatic calendar always displays the correct date.
12/24-hour timekeeping
Times can be displayed in either a 12-hour or 24-hour format.
Mineral glass
The tough mineral glass resists damages.
Stainless steel resin case
The case of the watch is made of stainless steel and resin.
Solid stainless steel band
Strong, durable and elegant: a steel bracelet with full links gives a classic look and high quality to your watch.
Safety Catch
Always reliable: This watch has a particularly secure safety catch, which helps prevent the strap from opening by mistake.
Water resistance classification (20 bar)
Perfect for free diving without scuba gear: the watch is water resistant up to 20 bar according to ISO 22810.
What’s in the box?
3-year warranty
User manual
Warranty card
Casio box
Reviews about G-SHOCK Casio G-Steel Premium Bluetooth Solar GST-B100D-1AER (26)
This is the model for the guy who needs something rugged but wants to avoid the typical plastic look. The G-Steel GST-B100D-1AER combines the legendary durability of G-Shock with the elegance of stainless steel. It looks substantial and solid on the wrist—the 53mm case makes an impression, but thanks to its refined design, it pairs perfectly even with more casual outfits, not just for the gym. What I love about it is the Tough Solar technology—you can forget about changing batteries, because the watch charges from any light source. Plus, Bluetooth allows for instant time synchronization with your phone and easy configuration of alarms or world time via the app. It’s a “special-duty” watch that isn’t afraid of water (200 m water resistance), shocks, or even vibrations, thanks to the use of a special alphaGEL material.
Czarekk.
1/27/26
100%
A great choice right after buying the Seiko Divers. It looks beautiful. Perfectly casual.
Grzegorz
1/6/26
100%
A hassle-free shopping experience with fast shipping.
Dajana
12/21/25
100%
I've had it for four years. It works great. The only downside is that the ink from the lettering on the envelope starts to fade after just a month. Other than that, it's indestructible.
Jaroslaw
12/12/25
60%
It's a very nice watch, quite sturdy, but something's broken on my model—I have to reset it all the time, and when I try to set it through the app, it just gives random times. It's a shame, because the watch is beautiful.
Daniel
12/8/25
100%
I bought this watch with a mechanical solar movement. It’s precise and reliable. It’s very comfortable to wear and looks great. I recommend it to anyone who loves sturdy watches.
Kuba_77
9/24/25
100%
The watch makes a very solid impression—the steel case combined with resin elements, the precise craftsmanship, and the elegant dark dial give it a look that’s both professional and sporty. Bluetooth functionality and solar technology are huge pluses — I don’t have to worry about changing batteries or setting the time manually; everything syncs with my phone. In performance tests, the stopwatch, timer, and alarms work flawlessly, and the 200-meter water resistance gives me peace of mind even while swimming or during more intense contact with water. However, the watch also has its drawbacks—its 14 mm thickness and 53 mm wide case can be noticeable on a smaller wrist, which sometimes limits comfort in folded cuffs. Additionally, the LED backlight can be a bit dim in very dark conditions—I often have to hold down the button to see the time clearly. Despite these minor drawbacks, I consider it an excellent premium watch: durable, technically advanced, and stylish—it fully meets the expectations of the G‑Steel line.
Bart7
5/14/24
100%
The G-SHOCK watch is simply amazing! I really appreciate its exceptional durability and shock resistance. As someone who leads an active lifestyle, I need gear I can rely on in any conditions. This watch performs great—from mountain climbing to everyday use. Plus, the ability to negotiate the price was a nice surprise and allowed me to make the purchase within my budget. I highly recommend it!
Anna Q.
4/4/24
100%
I’m very happy with my purchase! The product turned out to be exactly what I needed. I’d especially like to highlight how simple the return process was. I had to make one exchange and was pleasantly surprised at how quickly and smoothly everything went. That’s really rare these days, so I appreciate it all the more when a store prioritizes customer convenience at every step. I’ll definitely be back here for future purchases!
Julia
11/12/23
100%
I've had it for 4.5 years
Used at
School/now college
Work
Construction sites
Parties
Swimming pools
Saltwater
Anywhere and everywhere
I don’t worry about it because I know it can handle anything
Admittedly, the bracelet is a bit worn, but what metal wouldn’t be after that long? The glass is in perfect condition, not a single scratch.
After 2 years, I did have a temporary issue with it because it was getting stuck, but I read somewhere in a forum that it was a charging issue. Since I was working in a dark office, I left it on the windowsill at home for 2 days, and it never happened again (you just have to wear it).
As far as I’m concerned, this watch is indestructible. I recommend it to anyone who wants to start their adventure with G-Shock. After this watch, you won’t want any other brand.
Dżony
10/6/23
100%
Casio is an excellent men's watch. Swiss precision, black color, and solar power. I managed to negotiate a great price—I highly recommend it!
Tomasz
7/27/23
100%
The Casio is an elegant men's watch. It features a Japanese movement, durable stainless steel, and solar power. The customer service was excellent—I highly recommend it!
Jakub
6/19/23
100%
A Casio watch is a great choice. It features a black design, a Japanese movement, and solar power. It’s perfect for men who value both sustainability and style.
Artur
8/9/20
100%
Perfect purchase! I have been thinking for a long time about buying this watch model with a sporty character. I wanted a G-Shock watch, but I didn't really like the plastic-coated watches. I think this model is an excellent compromise. I sincerely recommend! It is amazing!
Krzysztof M. Woźny
8/9/20
100%
A perfect purchase! I’d been thinking about buying this sporty watch model for a long time. I wanted a watch from the G-Shock series, but I wasn’t too keen on the plastic-covered ones. I think this model is the perfect compromise. I highly recommend it! It’s amazing!
Krzysztof M. Woźny
9/7/18
100%
I have been using it for a month and I am delighted. The mechanism works great and loads very quickly. Great color and workmanship - you can see at first glance that this is a specific piece of equipment: D
Łuki
9/7/18
100%
I've been using it for a month now and I'm thrilled. The mechanism works great and charges very quickly. Great color and build quality—you can tell at first glance that this is a solid piece of gear :D
Łuki
9/7/18
100%
Since I found out about it when I bought it, it is trouble-free and quickly connects to the phone. Irreplaceable, I recommend it.
aresss66
9/7/18
100%
Ever since I decided to buy it, it’s worked flawlessly and connects quickly to my phone. It’s indispensable—I highly recommend it.
aresss66
6/15/18
100%
Very functional. Solar works fine. I recommend.
Gienek
6/15/18
100%
Very functional. The solar panel works flawlessly. I recommend it.
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The administrator of your personal data is the owner of the Watchard store, i.e. 57 Concepts Sp. z o.o. Sp. k. with the registered office at al. Witosa 31, lok. 115, 00-710 Warsaw, Poland. Providing personal data by the Customer is voluntary but necessary to complete the purchase. You have the right to view your personal data we have processed, as well as the right to request changes or removal of your personal data. Personal data will be processed for a period of 10 years.
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