Casio G-Shock GM-2100 Watches

Quick Content Guide

  1. Japanese approaches to Tough and Functional Watches in GM-2100 *the most distinctive features in details
  2. General information about the watch *year of first release, model range etc.
  3. GM-2100 Usage Patterns *what the watch is usually meant for
  4. Feedback from Users and Experts *anonymous from different sources
  5. GM-2100 Model Range *in different colors and bands
  6. GM-2100 Limited Editions *unique style, materials, and price
  7. The most distinctive specs *from our Editorial point of view
  8. Other G-Shock GM Watches *similar by price and functions but different by cases
  9. Official GM-2100 Specs *all details and for base version GM-2100N-2A
  10. GM-2100 Comparison Table *with similar G-Shock Watches

Enjoy Japanese approaches to Tough and Functional Watches!

*some images are about G-Shock 5000/5600 cases, but the technology, approaches, concepts and philosophy remains the same for the whole G-Shock Model Range

Hollow case structure. Based on a realization that “shocks are not transmitted inside a bouncing rubber ball,” the structure was designed to let the module float inside the case, relieving shocks transmitted from outside. Today, the module’s shock resistance is realized through further technical innovations. But the revolutionary tough structure that gave G-SHOCK its origin began here.

All-directional covering. If the watch is dropped, the protruding bezel fully enclosing it absorbs the shock, protecting the buttons directly connected to the module and alleviating shocks from all directions. The bezel also guards the surface of the crystal. The band is curved stiffly at the point of connection with the case, moreover, enabling it to serve as a shock absorber and prevent direct shocks to the back of the case.

Protective cushioning of key parts. The crystal oscillator and other critical parts inside the module are guarded individually by cushioning material. Any strong shock to the watch causes immediate distortion of the cushioning inside the module, preventing contact failure and malfunction.

Japan Quality. Constructed with genuine quality, CASIO products provide truly practicable applications in which functionality and beauty combine. The leading-edge LSI technologies and skilled craftsmanship that give life to CASIO watches exemplify the quality Japan boasts in the world marketplace.
For CASIO, “faith in manufacturing” refers to an inexorable advancement of digital technologies and an uncompromising commitment to fine craftsmanship. This faith engenders unparalleled performance that not only elevates CASIO watches as close as possible to perfection, but that actually changes their wearers’ lifestyles.

General Information

Pricemay be available 
*average Amazon Price, we may earn commission from purchases
Year of first Release2021
Model RangeSTANDART ANA-DIGI (This Line includes Digital and Analog displays on G-Shocks that are the best in “price/quality” category. Usually have traditional digital functions, but with beautiful hands. Don’t worry, the hands won’t prevent you from seeing digits, since there is a special Hand Shift technology that moves them to the neutral position)
Battery Type(G-Shock Batteries)
Other Divisions the GM-2100 belongs to: *you may find all watches of the division by clicking on the linkG-Shock Ana-Digi
G-Shock Carbon Core Guard
G-Shock 2021

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GM-2100 Usage Patterns *what the watch is usually meant for

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Feedback from Users *accumulated information from our own comments and emails, forum threads, socials, reviews, etc.

+ at this this rate they’re going to need their own watch case
+ the green realy nice look
+ the new watch dials are amazing

– no solar and no rc
– there’s a problem with legibility
– the lume is not good, no lume on index markers, reverse LC displays almost unreadable

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GM-2100 Model Range *may be updated

*You may find updated information about colors on our G-Shock 2021 New Releases page →

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GM-2100 Limited Editions *unique style, materials, and price

The Listing of All G-Shock GM-2100 Limited Watches → *with detailed description about the style

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The most distinctive specs of GM-2100 *Editorial
Steel Casio Oak (popular octagonal bezel. Casio simply replaced the watch with a stainless steel bezel and case, making the watch more stylish and more weighty)
Carbon Core Guard Structure (protects the module with a carbon case. Highly durable carbon fiber-reinforced resin is added not only to the center case, but also to the front and side button guards, providing even stronger resistance to shocks from above or below, or from any side)
Stylish Look (for everyone for any style)
200-meter water resistance (good for swimming but not for deep diving)

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Other G-Shock GM Watches *similar by price and functions but different by cases

These are not all G-Shock GM Series. Here is a list of All G-Shock GM Watches →

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Official Marketing Focus from Casio

Like other GM models (GM-5600GM-6900GM-110), the GM-2100 is based on its all-resin counterpart and has a stainless steel bezel. Considering the popularity of the GA-2100 series, a metal-covered “CasiOak” was inevitable, but we were not expecting to see it so soon.

Official GM-2100 Specs / Features *for base version GM-2100N-2A

  • Case / bezel material: Resin / Stainless steel
  • Resin Band
  • Mineral Glass
  • Carbon Core Guard structure
  • 200-meter water resistance

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GM-2100 Comparison Table with similar G-Shock Watches


Price (Amazon)

Year of first Release




±15 seconds per month

±15 seconds per month

SmartWatch Features




Double LED light

Neobrite (hands and hour markers) Double LED light


5 daily alarms

5 daily alarms



Measuring unit: 1 second
Countdown range: 24 hours
Countdown start time setting range: 1 second to 24 hours (1-second increments, 1-minute increments and 1-hour increments)



1/100-second stopwatch
Measuring capacity:
00'00''00~59'59''99 (for the first 60 minutes)
1:00'00''~23:59'59'' (after 60 minutes)
Measuring unit:
1/100 second (for the first 60 minutes)
1 second (after 60 minutes)
Measuring modes: Elapsed time, split time, 1st-2nd place times

Hourly Time Signal



World Time


31 time zones (48 cities + coordinated universal time), daylight saving on/off

Case / bezel material

Resin / Stainless steel

Carbon (Carbon Core Guard) / Resin


Mineral Glass

Mineral Glass


3 years

3 years on SR726W

Size (mm) *we consider 48.9×42.8×13.4 to be a traditional watch size (as in DW-5600). So you are to compare how far or close the watch is to this size

48.5 x 45.4 x 11.8


Full features (if you want to know more)

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Recent News about GM-2100 

All Casio GM-2100 News →

Not sure about GM-2100? There are more G-Shocks!

Back to All G-Shock Models →