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57 piecesfrom $105

GA-2100 “CasiOak”

The octagon that took over. The GA-2100 is slim, light and the most versatile canvas for custom color — explore every Bezelwright colorway.

57 products in GA-2100

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Stock GA-2100 · Casio specs

The G-SHOCK GA-2100 is Casio's slim octagonal analog-digital watch, nicknamed the “CasiOak”, measuring 11.8 mm thick and weighing 51 g.

Full GA-2100 guide
Case size
48.5 × 45.4 × 11.8 mm
Weight (stock)
51 g (1.8 oz)
Water resistance (stock)
200 m / 20 bar
Power
3-year battery
Module
5611

Figures describe Casio's stock model; custom builds can differ in finish, materials and water resistance.

Why the GA-2100 is called the CasiOak

Fans gave the GA-2100 its nickname for the eight-sided bezel that echoes far more expensive luxury sports watches. Its slim profile and analog-digital face make it easy to wear daily, which is why it is the most customized G-SHOCK in the world.

Pair it with a moissanite bezel

Our GA-2100 replacement bezels are set with VVS moissanite, a lab-created gem with more fire than diamond — braided, rainbow and classic pavé designs in silver-tone, gold-tone and rose gold-tone finishes. Check the model number on your case back before ordering.

GA-2100 FAQ

Is the GA-2100 the same as the CasiOak?

Yes. “CasiOak” is the community nickname for the octagonal G-SHOCK GA-2100 family. It is a fan nickname, not an official Casio product name.

What is the difference between the GA-2100 and GM-2100?

Both share the octagonal silhouette. The GA-2100 has a resin bezel and is lighter; the GM-2100 adds a metal-covered bezel for more weight and shine.