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The Casio G-Shock GM-B2100 is the full-metal version of the octagonal 2100 series: it pairs a stainless-steel exterior with G-SHOCK shock resistance, Tough Solar charging and Bluetooth time adjustment. Casio lists silver, black ion-plated and rose-gold finishes; the exact dimensions and weight cited here are for the regional GM-B2100D-1A reference.
What is the Casio G-Shock GM-B2100?
The GM-B2100 brings the angular, octagonal design of the 2100 G-SHOCK family to a metal exterior. Casio describes stainless steel for the case, bezel and band. “Full metal” refers to that exterior, not every component: fine-resin buffering parts sit between the bezel and case as part of the shock-resistant construction. Casio’s product page and its July 28, 2022 launch announcement describe the materials and construction.
![Casio GM-B2100BD-1AJF [G-Shock GA-2100 Series Full Metal Model with Smartphone Link] Men's Watch Shipped from Japan Aug 2022 Model](https://m.media-amazon.com/images/I/41NKkEMv0-L._SL160_.jpg)
![Casio GM-2100BB-1AJF [G-Shock (G-Shock) Metal Covered Series Blackout] Watch Imported from Japan Feb 2023 Model, Black, Mens, Black, Modern](https://m.media-amazon.com/images/I/41YV+AJKF6L._SL160_.jpg)
It is an analog-digital watch rather than a digital-only model. Its functions include world time, a 1/100-second stopwatch, countdown timer, five daily alarms, hand shifting to clear the digital display, and double LED lighting branded Super Illuminator. The lighting is intended to illuminate the dial and digital display.
What are the GM-B2100’s dimensions and specifications?
Casio’s Middle East & Africa listing for the GM-B2100D-1A gives a case size of 49.8 × 44.4 × 12.8 mm and a weight of 165 g. These figures apply to that listed reference and market; check the exact regional SKU when comparing another listing. Casio Middle East & Africa: GM-B2100D-1A.
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| Specification | GM-B2100D-1A listing |
|---|---|
| Case size | 49.8 × 44.4 × 12.8 mm |
| Weight | 165 g |
| Case and bezel | Stainless steel |
| Band | Stainless-steel solid band; one-touch three-fold clasp |
| Glass and back | Mineral glass; screw-lock back |
| Shock and water resistance | Shock resistant; 200 m water resistance |
| Power and connectivity | Tough Solar; Bluetooth time adjustment |
| Listed band-size range | 150 to 205 mm |
The 165 g weight and metal bracelet are worth considering if you prefer a lighter watch. The listed band-size range is a sizing specification, not evidence that a different bracelet or strap will attach to the watch.
What is the difference between GM-B2100D, GM-B2100BD and GM-B2100GD?
Casio’s July 2022 launch announcement identifies the three finishes below. Check the complete model reference on a regional product page or retailer listing: suffixes can differ by market, and Casio’s Middle East & Africa listing, for example, is GM-B2100D-1A.
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![Casio GM-B2100GD-9AJF [G-Shock (G-Shock) Full Metal Model with Smartphone Link GM-B2100 Yellow Gold Color Model] Watch Japan Import March 2023 Model](https://m.media-amazon.com/images/I/51R5kAE7MML._SL160_.jpg)
- G-SHOCK is a shock-resistant clock that builds a new concept of toughness on the watch. It is a full metal model equipped with a smartphone link in the digital/analog combination ''GA-2100'' series developed after inheriting the concept of the first model DW-5000C.
- [Shock-resistant structure] G-SHOCK's core technology in pursuit of toughness is resistant to shocks that protect the module with a unique uneven shape, preventing direct impact on glass & buttons.
- [20 aThesis waterproof] A variety of places & situations can be used, such as daily water work, swimming, surfing, jet skiing, etc.
- [Mobile link function] Compatible mobile phones can be linked by Bluetoothⓡ communication.
- [Other product specifications] Tough solar/needle evacuation function/World time/stopwatch/timer/time alarm/battery indicator display/power saving function/full auto calendar/12/24 hours display switching/operation sound ON/OFF switching/date switch/date Display / day display / double LED light
| Model family | Finish in Casio’s launch announcement |
|---|---|
| GM-B2100D | Silver |
| GM-B2100BD | Black ion-plated |
| GM-B2100GD | Rose gold |
The cited announcement establishes those finish distinctions, not a difference in core functions among the three versions. Confirm the exact SKU and local listing before purchase, since naming and availability may vary by region. Casio’s launch announcement.
Is the GM-B2100 solar powered and Bluetooth connected?
Yes. The GM-B2100 uses Casio Tough Solar and can connect to a smartphone by Bluetooth for time adjustment. Casio’s launch announcement lists automatic time adjustment and a hand-shift feature, along with the other functions described above. The Bluetooth link is relevant to connected features; it does not mean the watch needs a phone for every basic timekeeping function.
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- Go metal-clad with this Casio G-Shock Analog-Digital watch in an ever-popular color scheme of black and gold
- Metal bezel ion-plated in gold and set against a black base is a stylish design choice
- battery life: 3 years on SR726W X 2Casio G-Shock Style #: GM-2100G-1A9
Casio distinguishes the world-time city count on the watch from the larger catalog in its companion app: the launch announcement specifies world time for 38 cities plus UTC on the watch and approximately 300 cities in the app. These are separate figures, not alternate counts for the same watch menu. App availability and current phone compatibility should be checked for the owner’s region and device; the cited product materials do not establish current OS compatibility.
Casio’s July 2022 release estimates about 7 months of operation after a full charge when using all functions without solar charging, or about 18 months after a full charge with power saving enabled. Those are manufacturer estimates under the stated conditions, not guarantees of an individual watch’s real-world battery life. Casio, July 28, 2022.
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How should you choose a GM-B2100?
- Choose the finish and verify the SKU. The documented launch finishes are silver GM-B2100D, black ion-plated GM-B2100BD and rose-gold GM-B2100GD. Regional references may add characters such as “-1A.”
- Check the fit and weight. Use the dimensions and weight on the page for the exact reference you are considering. The GM-B2100D-1A listing is 49.8 × 44.4 × 12.8 mm and 165 g.
- Decide whether the feature mix suits you. Consider whether you want the metal exterior, Tough Solar, Bluetooth time adjustment, analog-digital display, stopwatch and alarms, and whether you will use the illumination and linked functions.
- Confirm local purchase and service details. Price, stock and warranty terms depend on retailer and region; check the seller and local Casio support rather than assuming details are universal.
The official specifications establish the listed features, but do not establish independent comfort assessments or comparative long-term durability. No specific aftermarket band or replacement part compatibility is confirmed by the cited product and support materials.
Where can GM-B2100 owners find manuals and support?
Casio Singapore’s support page for GM-B2100D-1A links an operation guide and user guide, plus FAQs covering battery, band, features, apps, care, troubleshooting and after-sales service. It also provides repair and warranty navigation. Use the Casio support site for your own region, because service access and warranty terms are regional. Casio Singapore GM-B2100D-1A support.
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