Casio G-SHOCK GM-B2100

The best-selling G-SHOCK 2100 series from Casio now welcomes a full-metal variant, the GM-B2100.

GA-2100 was introduced in 2019 as a modern interpretation of the very first G-SHOCK, the DW-5000C. Thanks to its streamlined, minimalist design and the attractive octagonal bezel design, this model became a highly sought-after contemporary timepiece.

Casio G-SHOCK GM-B2100D-1AER

The new “CASIOAK” with metal design proudly features iconic octagonal bezel of the 2100 line. The Casio G-SHOCK GM-B2100 watch employs stainless steel as the exterior material for the case, band, and bezel.


In order to ensure shock resistance, the shock-resistant structure created for the iconic shape of the full-metal GMW-B5000 was adopted for the screw-back case, band, and bezel joints of these watches as well, with buffering components made of fine resin installed between the bezel and case.


Solid and stylish, the octagonal bezel of G-SHOCK GM-B2100 was made using multiple processes: forging, then cutting and polishing.

Casio G-SHOCK GM-B2100D-1AER

To accentuate the beauty of the metal, the components are treated with different finishes — the bezel with a circular hairline finish on its top surface, the band with a vertical hairline finish, and the bezel bevel, buttons and case back with a mirror finish.


The dial is composed of multiple parts to create depth and dimension, while the inset dial ring at the 9 o’clock position and the index marks are treated with a vapor deposition finish.

Casio G-SHOCK GM-B2100D-1AER stainless steel version with silver color
Casio G-SHOCK GM-B2100D-1AER

Three versions are available: the GM-B2100D with stainless steel finish, the GM-B2100BD with black ion plating, and the GM-B2100GD with rose gold finish.

Casio G-SHOCK GM-B2100BD-1AER Black IP version

The new Casio G-SHOCK GM-B2100 watches are powered by a Tough Solar charging system that eliminates the need to regularly replace the battery.

Casio G-SHOCK GM-B2100GD-5AER rose gold toned version

Just like the Casio G-SHOCK GA-B2100 model released this year, these timepieces are also equipped with Smartphone Link connectivity via Bluetooth®. This functionality offers accurate timekeeping and easy setting of alarms, countdown timer, world time and other functions from a smartphone app.


Technical details

Model: Casio G-SHOCK GM-B2100

Model Colors
GM-B2100D-1AER: Silver
GM-B2100BD-1AER: Black
GM-B2100GD-5AER: Rose Gold

Material: Steel
Size of Case: 49.8×44.4×12.8mm
Construction: Shock-resistant
Water Resistance: 20 bar

Communication Specifications
Communication Standard: Bluetooth® low energy
Signal Range: Up to 2 meters (may differ depending on surrounding conditions)

World Time
38 time zones (38 cities + coordinated universal time), daylight saving on/off, auto summer time (DST) switching, home city/world time city swapping

1/100 second (00’00”00~59’59”99) /1 second (1:00’00” ~23:59’59”); measuring capacity: 23:59’59.99″; measuring modes: elapsed time, lap/split time
Countdown Timer
Measuring unit: 1 second (maximum 1 hours)

5 daily alarms; hourly time signal

Mobile Link Feature (Wireless linking with Bluetooth® devices)
Auto time adjustment
Easy watch setting
Approximately 300 world time cities
Time & place
Phone finder

Other Functions
Hand shift feature; date/month display swapping; day display (in English, Spanish, French, German, Italian or Russian); full auto-calendar; 12/24-hour format; button operation tone on/off; battery level indicator; double LED light (Super Illuminator and afterglow: 1.5 seconds or 3 seconds)

Power Source
Tough Solar power system (solar-charging system)

Continuous Operation
About 7 months after full charge, using all functions but without solar charging
About 18 months with the power-saving function ON after full charge

Total Weight
Approx. 165g