*GMC-B2100D-1A — Updated September 2025 color!
★★★★
Key Takeaways. The GMC‑B2100 delivers a sleek, full-metal evolution of the beloved 2100 octagon, blending daily wearability with chronograph utility, solar power, and Bluetooth time sync — all wrapped in classic G-Shock durability. But at around US $800, it treads a fine line between high-end styling and perceived overpricing, especially compared to resin or mid-tier metal alternatives. Some craftsmanship aspects like crystal type, backplate, and finishing feel short of premium expectations.
| CASIO Price *official | $740 |
| Amazon Price *affiliate | from $735 |
GMC-B2100 Model Range *may be updated
PROs
Full-metal, full-analog design – The first metal version of the 2100 series, with a refined octagonal chronograph aesthetic.
Balanced wrist presence – At ~46.3 mm and only 12.4 mm thick, it feels substantial yet never oversized.
Chronograph subdials – Offers analog stopwatch (12 hr totalizer), day-of-week and mode/battery indicators — blends style with function.
Bluetooth time sync + world-time – Syncs with smartphone; supports world timer (up to 300 cities) and app control.
Tough Solar power – Solar-charged with long autonomy: ~5 months full charge, ~18 months in power-save.
Rugged and water-resistant – Retains G-Shock shock resistance and 200 m WR.
High readability and finishing – Mirror-finished hands, layered dial depth, and bright LED light ensure clarity.
Stylish dial depth – Machined layers, alternating brushed/polish on case and bracelet make it dressy yet tough.
No-nonsense full functions – Stopwatch, alarm, countdown, flight-log timer — all without the fuss of complex menus.
Easy wear for analog G-Shock fans – Despite metal build, it’s wearable daily, both with casual and suit attire.
CONs
High price point – At US $800, many feel it’s overpriced for a quartz chronograph.
Simple backplate design – Uses a simple flat caseback instead of a screw-down, seen as less premium.
Mixed finishing quality – Some report bezel edges and dial finishing feel cheap or overly shiny.
Larger feel than resin version – Slightly bigger and heavier than resin 2100, may feel bulky for smaller wrists.
Mineral glass — no sapphire – Still uses mineral crystal; sapphire would be expected at this price.
Value versus resin or GM-B2100 – It lacks relative value compared to cheaper resin ($150) or GM-B2100 ($550).
No multiband atomic sync – Only Bluetooth time sync; lacks radio (Multi-Band) feature
Formatting of dial is busy – Some find the chronograph subdials and indicators cluttered or hard-to-read.
Band rattliness – The steel bracelet feels a bit loose or “”rattly””.
Mixed community reception – Some fans dismiss it as Casio “milking fans” or criticize the overall quality for its price.
*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.
General Information
| Price | from $735 *average Amazon Price, we may earn commission from purchases |
| Year of first Release | 2024 |
| Suitable for Wrist Size | 150 – 205 mm |
| Module Number | 5733 / Manual |
| Battery Type | Tough Solar (Solar powered) (G-Shock Batteries) |
Japanese Unique Features in GMC-B2100
Multi-hand dial exuding functional beauty
The dial features an effective 6-9-12 inset dial layout. The mirror finish applied to the hands and the grind-polished indexes add further refinement. The inset dial ring at the 9 o’clock position features a design motif inspired by the iconic octagonal bezel of 2100 Style watches. For the GMC-B2100AD, light blue vapor deposition is applied across the surface of the dial for a fresh, crisp look.
Sophisticated metal form created with precision crafting
Undergoing multiple meticulous processes of forging, cutting, and polishing, the bezel and case are precisely crafted down to the intricately shaped back, which is the key to the precision fit. The bezel shines with an attractive circular hairline finish on its top surface. The band, which reproduces the dimpling of the very first G-SHOCK band, but now in metal, offers enhanced textures by using differentiated hairline and mirror finishes.
Full metal shock-resistant structure: Delivering both strength and beauty
The watch is guarded by a full metal exterior, with stainless steel material used for the bezel, case, and band. Fine resin buffering components are installed between the bezel and case to help absorb impacts to the module. Additionally, a three-pronged structure is employed for the lugs on the case to disperse shock to the connective part of the band.
Slim design achieved with high-density mounting
Employing a slim module, the watch maintains the same sense of size as the previous GM-B2100 while offering a multi-hand dial, wider range of functions, and full-metal construction. While delivering high utility with Smartphone Link and solar-powered functionality, the GMC-B2100 offers a comfortable fit on the wrist, as well.
Octagonal screw-lock crown for a powerful sense of presence
The side of the case is fitted with a crown to complement the fully analog face design. The crown features a screw-lock construction and the same octagonal shape as the bezel, adding a powerful sense of presence to the full-metal form of the watch. This original structure delivers a more compact form while maintaining the same shock resistance.
Solar-powered timekeeping with Bluetooth® for enhanced accuracy and reliability
Super Illuminator (high-brightness LED light) for maintaining watch readability in the dark
GMC-B2100 on the wrist!
