A light-emitting diode (LED) is used to illuminate the watch face.
Shock-resistant
Shock-resistant construction protects against impact and vibration.
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.
Stopwatch function - 1/100 sec. - 24 hours
Accuracy of measurement up to 1/100 of a second, measuring range 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.
5 daily alarms
The daily alarm reminds you about recurring events with an acoustic signal at the time you have set. This model has 5 independent alarms for flexible reminders of important appointments.
Button tones on/off
The button tones for using the mode button can be turned off. This means that the watch no longer beeps when switching from one function to another. Preset alarm or countdown timers remain active when the button tones are deactivated.
Hand Moving Function
With a push of a button, hands are moving and permit a free visibility of functions like stopwatch or date.
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.
Carbon-reinforced resin casing
Thanks to its extremely high level of durability, resin is the ideal material for watches. Combining resin with carbon—a particularly robust material—creates a casing that is even more stress-resistant and offers even greater protection against external influences, resulting in an extremely high level of durability.
Resin band
Synthetic resin is the ideal material for wrist straps thanks to its extremely durable and flexible properties.
Folding clasp
The watch has a folding clasp.
3 Years - 1 Battery
The battery supplies the watch with sufficient energy for approx. three years.
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 Octagon Carbon Core Guard GA-2100-1A2ER (11)
This G-SHOCK pleasantly surprised me with how light it is. Thanks to the use of carbon fiber, the watch is almost imperceptible on the wrist, yet it feels incredibly rugged and sturdy, which is crucial given my active lifestyle. It’s a great combination of durability and all-day comfort.
Junak
4/24/26
100%
The quality is exactly as described.
jaroq.
3/13/26
100%
I chose this watch because of its sturdy rubber strap. It’s comfortable to wear every day. It looks great on my wrist. The store provides fast and professional service, so I can recommend it.
Leon
3/6/26
100%
I'm happy with my purchase from this store. The black rubber watch strap fits well on my wrist and looks stylish. Shipping was fast and free. The entire order process went smoothly.
Wiśniewscy
2/19/26
100%
I was looking for something that could withstand anything without looking like a huge chunk of plastic on my wrist—and this G-SHOCK is an absolute winner. The Carbon Core Guard does the job: the watch is incredibly light, yet you can tell it’s built like a tank. I love the octagonal case shape because it looks modern and really stands out from classic models. The blue accents on the dial nicely break up the deep black, and the LED backlight is bright enough that I can easily check the time at night. The biggest plus for me is the 200m water resistance—I take it to the pool or the lake without a second thought. Despite its sporty character, because it’s quite slim, it fits easily under the cuff of a sweatshirt or jacket. If you need a watch you don’t have to worry about in any situation, I’d buy this one without hesitation.
Angel
12/28/25
100%
This watch is great thanks to its daily calendar and backlight. The purchase at the store went smoothly, and free shipping is an added bonus. I highly recommend it!
A.f.
12/2/25
100%
I am very pleased with my purchase of this model. It has a modern and stylish look, yet it is also very durable. I also really appreciate the fast order processing and the store’s professional service. The order arrived on time, well-packaged, and without any damage. I rate my shopping experience here positively and will gladly shop here again; I recommend it to anyone looking for a reliable product and a hassle-free transaction.
Koroneczka
3/18/25
100%
I bought this G-SHOCK watch as a gift for my husband, and I’ve been happy with my choice from the very beginning. The carbon case is this model’s standout feature—it’s lightweight yet extremely durable and damage-resistant, which is a huge plus for an active man. The combination of sturdy construction and modern design looks great. Plus, the price is very attractive considering the quality and functionality of this watch. I definitely recommend it!
Weronika
12/25/24
100%
The G-SHOCK watch is a really great choice! The Japanese quartz movement with the Casio 5611 caliber makes me feel confident wearing it every day. It’s super durable, perfect for my activities. Plus, the option to include my own photos in the product description helped me better assess how it looks on the wrist. It was great to see it in action on others before buying. I really have nothing to complain about, and 5 stars is the absolute minimum it deserves! Masterpiece!
TomcioQ
12/6/24
100%
Great product!
Szymek.S
3/28/24
100%
The G-SHOCK watch with a rubber strap is the perfect choice for active people. The rubber strap is extremely comfortable and doesn’t irritate the skin, even when worn for long periods. It’s also very durable, making it perfect for a variety of conditions, from everyday walks to intense workouts. An added bonus is the best price on the market, making it a great choice for anyone looking for quality and durability at an affordable price. I definitely 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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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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