Is the Casio G-Shock GM-B2100BD-1AER worth it compared to the resin GM-2100?

The full-metal version offers a more premium look and feel, plus solar power and Bluetooth. If you prefer a lighter watch and don't need those features, the resin model may suffice.

How does the GM-B2100BD-1AER differ from the original GA-2100?

The GM-B2100BD has a stainless steel case and bracelet, Tough Solar, and Bluetooth mobile link. The GA-2100 is resin-cased, battery-powered, and lacks Bluetooth.

Does the watch have a sapphire crystal?

No, it uses mineral crystal, which is more prone to scratches than sapphire.

What is included in the box?

The watch, a user manual, and warranty information are typically included. No extra tools or accessories are provided.

Can the bracelet be resized?

Yes, the stainless steel bracelet has removable links and a clasp, so it can be adjusted for fit, though you may need a tool or a jeweler.

Is the watch suitable for swimming?

Yes, it has 200-meter water resistance, making it suitable for swimming and snorkeling, but not for diving.

Where is the Casio G-Shock GM-B2100BD-1AER Men's Watch cheapest?

At CreationWatches, for $410.00, 31% under what the other stores charge, as of our latest check.

What do buyers say about the Casio G-Shock GM-B2100BD-1AER Men's Watch?

Rated 4.7 out of 5 from 126 ratings.

Where can I buy the Casio G-Shock GM-B2100BD-1AER Men's Watch?

13 stores we checked sell it, including CreationWatches, First Class Watches, CreationWatches.com, Walmart, eBay.

Casio G-Shock GM-B2100BD-1AER Men's Watch

Best price now

$410.00at CreationWatchesChecked Nov 9

31% under what the other stores charge

Compared across 14 stores. Prices are checked against each store and labelled with when. Store links may earn us a commission. Price via Klarna.

Visit CreationWatches

What reviewers say

4.7 / 5126 ratings

Owners appreciate the GM-B2100BD's solid metal build, solar charging, and Bluetooth timekeeping. Many mention the weight and the legibility of the blacked-out dial as drawbacks, but overall satisfaction is high.

What people mention

Build qualityPraisedReviewers describe the stainless steel case and bracelet as solid and well-finished, giving the watch a premium feel.
WeightMixedSome owners find the watch heavy compared to resin G-Shocks, while others see the weight as a sign of durability.
LegibilityCriticisedThe all-black dial and hands are often mentioned as hard to read in low light.
Solar chargingPraisedTough Solar is frequently highlighted as a convenient feature that eliminates the need for battery replacements.
Bluetooth connectivityMixedWhile many like automatic time adjustment via the app, some report occasional pairing issues.
Crystal durabilityCriticisedA few reviewers note that the mineral crystal scratches more easily than sapphire.

About the Casio G-Shock GM-B2100BD-1AER Men's Watch

The Casio G-Shock GM-B2100BD-1A is a men's analog-digital quartz watch with a black dial and a black ion-plated stainless steel case and bracelet. It uses caliber 5691, a mineral crystal, a screwed case back and a buckle clasp. The case is shock resistant and water resistant to 200 m.

The watch is powered by Tough Solar. It connects to a phone through Mobile Link, which provides automatic time adjustment, easy watch setting, a phone finder and a time and place reminder. World Time covers approximately 300 cities.

Other functions include a 1/100-second stopwatch, a countdown timer, 5 daily alarms and an hourly time signal. The watch has a full auto calendar with month, day and date display, and a 12/24-hour display. It has a double LED light, Neobrite luminous hands and markers, a power saving function, a battery level indicator, a hand shift feature and a button sound on/off setting.

Case material

Black ion-plated stainless steel

Bracelet

Black ion-plated stainless steel, buckle clasp

Case diameter

Approx. 44.4 mm

Case thickness

Approx. 12.8 mm

Lug width

16 mm

Crystal

Mineral