Is the GA-2100-1A1 good for small wrists?

Yes. At 11.8 mm thick it is the thinnest G-Shock combination model, so it sits flatter than most G-Shocks. The 49 mm case is still wide, so try one on if you have a very small wrist.

Can I swim or dive with it?

Yes. It is rated to 200 meters of water resistance and is shock resistant, so swimming and snorkeling are fine. Casio does not rate it for scuba diving.

Does it have solar power or Bluetooth?

No. It runs on a standard battery and has no Bluetooth or app connection. Solar charging and phone linking start on higher G-Shock lines.

How is it different from other GA-2100 versions?

This is the all-black monochrome version with a black resin band. Other GA-2100 variants change the color scheme or strap material but share the same case, module and features.

The watch, a Casio manual and the standard G-Shock packaging. No charging cable is needed since it uses a battery.

Is the digital display easy to read?

It is small and sits low on the dial, so owners say it takes a glance rather than a quick look. The double LED light helps in the dark.

Where is the Casio G-Shock GA-2100-1A1 cheapest?

At CreationWatches, for $106.00, as of our latest check.

Is the Casio G-Shock GA-2100-1A1 at its lowest price?

Yes: $106.00 is the lowest price we've seen for it since November 9.

Where can I buy the Casio G-Shock GA-2100-1A1?

21 stores we checked sell it, including Amazon, CreationWatches, Abt Electronics, Zales, Kay Jewelers.

Casio G-Shock GA-2100-1A1

Best price now

$106.00at CreationWatchesChecked Nov 9

Compared across 23 stores. Prices are checked against each store and labelled with when. Store links may earn us a commission. Price via Klarna.

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What reviewers say

Owners treat the GA-2100 as the G-Shock for people who dislike bulky G-Shocks. They praise the slim case, light weight and clean monochrome look, and most report it survives hard daily use. Complaints center on the small digital readout and the mineral glass.

What people mention

Size and weightPraisedOwners say the thin, light case wears far more comfortably than older, chunkier G-Shocks.
BuildPraisedReviewers report the carbon-reinforced resin and shock resistance hold up to drops and daily abuse.
DisplayMixedThe analog hands are clear, but owners find the small digital window hard to read, especially when the hands overlap it.
GlassCriticisedSome owners say the mineral glass scratches with normal wear.
LegibilityMixedThe monochrome dial looks sharp but gives low contrast in dim light without the LED.

About the Casio G-Shock GA-2100-1A1

The Casio G-Shock GA-2100-1A1 is an analog-digital watch in a simple monochrome design. It has a black 49 mm case made of carbon and resin, with a mineral glass crystal.

The case is made of high-strength resin reinforced with carbon fibers. At 11.8 mm thick, it is the thinnest among G-SHOCK combination models. The watch is shock resistant and water resistant to 200 meters.

It has a double LED light and a resin strap with a buckle clasp.

Case size

49 mm

Case thickness

11.8 mm

Case material

Carbon and resin

Crystal

Mineral glass

Strap

Resin, with buckle clasp

Display