| Size | ★★★★★ |
| Weight | ★★★★★ |
| Functions | ★★★ |
| Materials | ★★★★★ |
| Battery Years | ★★★ |
| Price | ★★★★★ |
Key Takeaways
The GMA-P2100 shrinks the beloved Casioak octagonal design into a petite, sporty 11 mm slab ideal for small wrists. It keeps the essential G‑Shock toolkit — LED lighting, Neobrite hands, timers, alarms, world time, and full shock/water resistance — wrapped in eco-friendly bio-resin, all for around $99. However, it skips solar/Bluetooth, sacrifices display area, and may feel too diminutive on larger wrists.
GMA-P2100 Model Range *may be updated
*Want to be the first to know about new G-Shock Updates? Here we store all recent Monthly G-Shock Updates →
PROs
Ultra-compact “Casioak” design – At 46 × 40.2 × 11.2 mm and about 40 g, it’s the smallest and slimmest in the 2100-series, perfect for smaller wrists.
Shortened band – Specifically made for petite wrists, enhancing comfort and fit.
Minimalist, clean dial – No sub-dial at 9 o’clock, offering a streamlined, modern look.
Biomass-resin build – Eco-friendly carbon-core guard with renewable bio-resin band and bezel.
Double LED Super Illuminator – Bright lighting with afterglow options, activated via button.
Neobrite-coated hands – Ensures legibility in low light.
Comprehensive functions – Stopwatch, countdown timer, 5 alarms, full auto-calendar and world time.
Durable and water-resistant – Maintains standard shock resistance and 200 m water protection.
Affordable (~US $99) – Delivers solid G‑Shock value with modern styling.
CONs
No solar or Bluetooth – Relies on CR1025 battery with ~3-year life; lacks wireless sync.
Mineral crystal – More prone to scratches than sapphire options.
Smaller than average – May appear too tiny on larger wrists; some users find it “too small”.
Button operation feels tight – Initial setup buttons can be small or awkward.
Minimalist dial lacks date – No day-of-week display, cut for simplicity.
Basic LCD area – The compact display shows less info; may feel cramped for power users.
No auto light/wrist sensor – Illumination must be activated manually.
No smartwatch-style alerts – Lacks Bluetooth notifications or time zone auto-switch.
Perceived as scaled-down women’s model – Called a “women’s watch” outside of official line, which may deter some buyers.
*PROs & CONs have been approved and selected by casiofanmag editors, devoted CASIO enthusiasts, who write news and test CASIO watches daily. If you want to add your points, please comment this page and we will review your experience.
Quick Content Guide
- GMA-P2100 Model Range *in different colors and bands
- Japanese Unique Features in GMA-P2100 *the most distinctive features in details
- General information about the watch *year of first release, model range etc.
- Official GMA-P2100 Video *only from Casio Company
- G-Shock GMA-P2100 Display Guide *for key functions only
- G-Shock GMA-P2100 on the wrist! *only images and only on the wrist
- GMA-P2100 Usage Patterns *what the watch is usually meant for
- G-Shock GMA-P2100 Watch Review *our detailed review of the watch
- Official GMA-P2100 Specs *all details and for base version GMA-P2100-2A
- GMA-P2100 Comparison Table *with similar G-Shock Watches
- Recent News about GMA-P2100 *the latest breaking news and videos
About the Watch in short.
Introducing the newest members of the 2100 line of octagonal watches, the GMA-P2100 timepieces join the GA-2100 and GMA-S2100 in a compact and minimalist design. Unlike their counterparts, these watches do away with the inset dial, opting instead for a sleek and simple look. Vibrant colors are used to add a touch of liveliness, with monochromatic finishes that exude a vibrant energy. Each component of these watches is meticulously finished in various shades and textures, creating a more detailed and intricate feel.
G-SHOCK Octagon Case Evolution Timeline
January, 2024
GMA-P2100
100$ on Amazon →
★★★★
The smaller version on popular GMA-S2100 with biomass plastic case and band
More →
August, 2022
GM-B2100
600$ on Amazon →
★★★★★
First full-metal addition to the continually evolving 2100 line of timepieces that inherit the legacy of the first-ever G-SHOCK, the DW-5000C.
More →
May, 2022
GA-B2100
160$ on Amazon →
★★★★★
Upgrade the retro look you love with the octagonal GA-2100 line, which inherits the design concept of the very first G-SHOCK, but now with Smartphone Link and Tough Solar power.
More →
August, 2019
GA-2100
130$ on Amazon →
★★★★★
The new Analog-Digital combination model that inherits the form of original G-SHOCK
The octagon form that was also employed for the original DW-5000C is installed in the series with carbon core guard structure which is the 3rd evolution of the materials of G-SHOCK.
More →
Enjoy Japanese Unique Features in GMA-P2100!
Vibrant monochromatic colour schemes.
From the case to the band to the watch face, the entire watch is finished in a vibrant monochromatic colour scheme. Light and dark shades of the same colour are used for different components, including the dial, index marks, and hands, to give the streamlined face without inset dials a look that is both highly expressive and easy to read.
Attention to materials: Bio-based resin.
Key resin components used in the bezel and band are made with bio-based resin. Produced using renewable organic resources, this material is expected to help reduce environmental impact.
Super Illuminator (high-brightness double LED light) for maintaining watch readability in the dark
General Information
| Price | $100 *average Amazon Price, we may earn commission from purchases |
| Year of first Release | 2024 |
| Suitable for Wrist Size | 145 – 190 mm |
| Module Number | 5730 / Manual |
| Model Range | G-SHOCK WOMEN (The Line includes watches that are smaller than original men’s variant, but have the same functions, technologies and other specs. Usually meant for women but also good for children and small wrists.) |
| Battery Type | CR1025 (G-Shock Batteries) Buy Battery on Amazon → |
| Other Divisions the GMA-P2100 belongs to: *you may find all watches of the division by clicking on the link | G-SHOCK 2024 G-SHOCK Ana-Digi G-SHOCK Biomass Plastic G-SHOCK for Small Wrists |
Official GMA-P2100 Video
G-Shock GMA-P2100 Display Guide *for key functions only. For you to know how it works))
General Display
- Hour hand
- Minute hand
- LCD
Stopwatch
The stopwatch measures elapsed time in 1/100-second units for the first hour, and in 1- second units after that for up to 24 hours.
Timer
The timer counts down from a start time specified by you. A beeper sounds when the end of the countdown is reached. The countdown start time can be set in 1-second units up to 24 hours.
G-Shock GMA-P2100 on the wrist!
GMA-P2100 Usage Patterns *what the watch is usually meant for
Enjoy our G-Shock GMA-P2100 Watch Review
Will be soon…
Official Casio Description.
Will be soon…
Official GMA-P2100 Specs / Features *for base version GMA-P2100-2A
- Case size (L× W× H): 46 × 40.2 × 11.2 mm
- Weight: 40 g
- Case and bezel material: Resin / Bio-based resin
- Band: Bio-based resin band
- Shock Resistant
- 200-meter water resistance
- Approx. battery life: 3 years on CR1025
- Mineral Glass
- Compatible band size: 145 to 190 mm
- Neobrite
- World time: 31 time zones (48 cities + coordinated universal time), daylight saving on/off
- 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 - Countdown timer
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) - 5 daily alarms
- Hourly time signal
- Double LED light LED light for the face (Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow) LED backlight for the digital display (Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)
- LED:White
- Full auto-calendar (to year 2099)
- Accuracy: ±15 seconds per month
- Button operation tone on/off
- 12/24-hour format
- Hand shift feature (Hands move out of the way to provide an unobstructed view of digital display contents.)
- Regular timekeeping:
- Analog: 2 hands (hour, minute (hand moves every 20 seconds))
- Digital: Hour, minute, second, pm, month, date, day
Not sure about GMA-P2100? There are more G-Shocks!
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