G-SHOCK GA-2100BM-7A5ER

The G-SHOCK GA-2100BM-7A5 is the rose gold version of the BRIGHT METALLIC DIAL series — a summer-leaning take on the iconic 2100 silhouette that pairs the slim octagonal-bezel “CasiOak” case with a colour dial finished in metallic vapor deposition. The dial, hands and applied indices are all coated in a soft, shimmering rose gold, while the bezel and band are made from clear skeleton resin so the inner case shows through. The result is the GA-2100 feel — minimal, instrument-like, instantly recognisable — re-cast as a lighter, more playful seasonal piece.

The case itself is pure 2100 — slim 48.5 × 45.4 × 11.8 mm dimensions, just 51 g on the wrist, and built around Carbon Core Guard construction with a forged carbon and resin shell. Shock-resistant construction and 20 atm (200-metre) water resistance handle daily wear and water-based activities, while two SR726W batteries are rated for approximately three years. A mineral glass front protects the dial, the band adjusts from 145 mm to 215 mm, and Neobrite luminous coating is applied for low-light readability.

Functionally this is a full G-SHOCK. The analog side runs two hands with a hand-shift feature that moves them clear of the digital display when needed, while the digital window adds world time across 31 time zones (48 cities + UTC), a 1/100-second stopwatch with split, a 24-hour countdown timer, five daily alarms, an hourly time signal and a full auto-calendar. A double LED Super Illuminator system lights both the dial face and the digital display in white, with selectable 1.5- or 3-second durations and afterglow. Quartz accuracy is rated at ±15 seconds per month, with a 12/24-hour format and a button-operation mute option.

For anyone drawn to the 2100 design but looking for something brighter and more seasonal than the standard black or all-metal versions, the GA-2100BM-7A5JF is a clear, considered take on the silhouette — a slim, tough analog-digital with a metallic dial that picks up the light, dressed in a clear band that wears as easily with summer styling as with everyday gear.

Basic Information

Module Number: 5611
Movement Type: Quartz (analogue + digital combination)
Precision: ±15 seconds per month
Battery: SR726W × 2, approx. 3 years
Weight: 51 g
Water Resistance: 20 atm (200-metre water resistance)
Construction: Shock Resistant, Carbon Core Guard structure
Released: April 2025

Case and Band

Case and Bezel Material: Carbon / Resin
Case Size (Length × Width × Height): 48.5 × 45.4 × 11.8 mm
Band: Resin band (clear skeleton)
Compatible Band Size: 145 to 215 mm
Glass: Mineral Glass
Other: Neobrite luminous coating; rose gold metallic vapor-deposition dial, hands and indices

Watch Features

Light: Double LED — Super Illuminator on dial face and on LCD; selectable 1.5- or 3-second illumination, afterglow; white LED
World Time: 48 cities (31 time zones, with daylight saving) + Coordinated Universal Time
Stopwatch: 1/100-second stopwatch (1/100 sec under 1 hour, 1 sec over 1 hour), 24-hour, with split
Timer: Countdown timer, 1-second setting unit, 24-hour maximum
Alarm: 5 daily alarms, hourly time signal
Calendar: Full auto-calendar
Mute: Button operation tone on/off
Other features: 12/24-hour format, hand shift feature (analogue hands move clear of digital display)
Regular timekeeping: Analogue hour and minute; digital hour, minute, second, pm, month, date, day