---
product_id: 686053467
title: "GMAS2100-1A"
brand: "g-shock"
price: "¥28505"
currency: JPY
in_stock: false
reviews_count: 13
category: "G Shock"
url: https://www.desertcart.jp/products/686053467-gmas2100-1a
store_origin: JP
region: Japan
---

# 200m water resistance carbon core guard, ultra-light 1/100-sec stopwatch precision GMAS2100-1A

**Brand:** g-shock
**Price:** ¥28505
**Availability:** ❌ Out of Stock

## Summary

> 🖤 Compact toughness meets chic sophistication — wear the watch that works as hard as you do.

## Quick Answers

- **What is this?** GMAS2100-1A by g-shock
- **How much does it cost?** ¥28505 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/686053467-gmas2100-1a)

## Best For

- g-shock enthusiasts

## Why This Product

- Trusted g-shock brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Endure:** Shock resistant with carbon core guard structure ensures rugged durability without bulk.
- • **Effortless Elegance:** Monochrome black resin strap paired with rose gold accents for a subtle yet standout professional look.
- • **All-Day Functionality:** Dual LED super illuminators, world time across 31 zones, 5 alarms, and a full auto-calendar to keep you on schedule.
- • **Waterproof Confidence:** 200-meter water resistance means you can conquer your day, rain or shine, without missing a beat.
- • **Slim & Sleek Powerhouse:** Downsized GA-2100 with a compact 42mm case, perfect for a refined wrist presence.

## Overview

The Casio G-Shock GMAS2100-1A is a downsized, lightweight, and shock-resistant analog-digital watch featuring a durable carbon/resin case, 200-meter water resistance, and a sleek black resin band with rose gold accents. Designed for professionals seeking a stylish yet rugged timepiece, it offers advanced functions like dual LED illumination, world time, stopwatch, countdown timer, and multiple alarms, all housed in a slim 42mm octagonal case.

## Description

From Casio G-Shock, this new GMAS2100 watch is a downsized version of the GA-2100 model. It is slim, lightweight, and compact in design and boasts a chic, monochromatic look. The octagonal bezel, flat face, simple bar hour markers, and carbon core guard structure that are distinctive features of the GA-2100 are now available in a compact configuration. The black resin strap and matching dial with rose gold-tone accents adds a feminine pop of color to this new style.Shock Resistant200-meter water resistanceCarbon Core Guard structureCase/bezel material: Carbon/ResinBlack Resin BandMineral Glass Neobrite Double LED light LED light for the face (Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)LED backlight for the digital display (Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)World time - 31 time zones1/100-second stopwatchCountdown timer5 daily alarmsHourly time signalHand shift featureFull auto-calendar (to year 2099)12/24-hour formatButton operation tone on/offRegular timekeepingSize of case : 46.2?42.9?11.2mmCasio Style #: GMAS2100-1A

Review: Great watch for wife - My wife wanted another G shock but she doesn't like Baby G shocks and she wanted something that was fitting for her work place. She saw these come out and she liked the black one. I bought it as a gift and it 100% met her expectations. It's a good size for a small wrist. It doesn't say Baby G on it which is a turn off for some people. The black is a nice shade for a clean look and the rose gold like accents give the watch a little something so it fits in well in a work environment and jewelry coordination. If it was like the all black larger version it would be too tacti-cool for some settings. It's super light and it reads well. This watch definitely fulfills every bit of its specs, advertising and online appearance. Sometimes it's hard to tell how a watch will look in person and on the wrist but this one was spot on. If you are liking it but are unsure, spring for it. It meets the hype, and some.
Review: Rugged but elegant - Beautiful watch and works great.

## Features

- From Casio G-Shock, this new GMAS2100 watch is a downsized version of the GA-2100 model
- It is slim, lightweight, and compact in design and boasts a chic, monochromatic look

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08ZDPZZFP |
| ASIN  | B08ZDPZZFP |
| Age Range Description | Adult |
| Band Color | Black |
| Band Material Type | Resin |
| Band Width | 24 |
| Bands | 1 |
| Batteries  | 1 LR44 batteries required. |
| Best Sellers Rank | #272,051 in Clothing, Shoes & Jewelry ( See Top 100 in Clothing, Shoes & Jewelry ) #602 in Women's Wrist Watches |
| Brand Name | G-Shock |
| Case Diameter | 42 Millimeters |
| Case Material Type | Carbon/Resin |
| Case Thickness | 11 Millimeters |
| Character | fashion |
| Clasp Type | Buckle |
| Closure Type | Buckle |
| Crystal | mineral |
| Customer Reviews | 4.4 4.4 out of 5 stars (240) |
| Date First Available  | March 18, 2021 |
| Department  | Watches |
| Dial Color | Black |
| Display | Analog-Digital |
| Embellishment Feature | Crystal |
| Face Style | Crosshair (possible other styles: Teaked, Linen) |
| Included Components | Band |
| Is Discontinued By Manufacturer  | No |
| Item Type Name | Sport Watch |
| Item model number  | GMAS2100-1A |
| Manufacturer | G-Shock |
| Manufacturer  | G-Shock |
| Model Name | Casio G Shock |
| Model Number | GMAS2100-1A |
| Pattern | Solid |
| Power Source | Battery Powered |
| Product Dimensions  | 8 x 5 x 5 inches; 5.29 ounces |
| Series Number | 2100 |
| Shape | Octagonal |
| Sport Type | Multi-Sport |
| Strap Type | Two Piece Strap |
| Style Name | Watches |
| UPC | 889232300252 |
| Unit Count | 1 Count |
| Warranty Type | Manufacturer |
| Watch Movement Type | Japanese Quartz |
| Water Resistance Depth | 30 Meters |
| Water Resistance Level | Water Resistant |

## Images

![GMAS2100-1A - Image 1](https://m.media-amazon.com/images/I/81t1YBvN-sL.jpg)
![GMAS2100-1A - Image 2](https://m.media-amazon.com/images/I/51o0SxlSabL.jpg)
![GMAS2100-1A - Image 3](https://m.media-amazon.com/images/I/51hnw7inHRL.jpg)
![GMAS2100-1A - Image 4](https://m.media-amazon.com/images/I/81lQY1uSV8L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great watch for wife
*by A***Y on July 14, 2021*

My wife wanted another G shock but she doesn't like Baby G shocks and she wanted something that was fitting for her work place. She saw these come out and she liked the black one. I bought it as a gift and it 100% met her expectations. It's a good size for a small wrist. It doesn't say Baby G on it which is a turn off for some people. The black is a nice shade for a clean look and the rose gold like accents give the watch a little something so it fits in well in a work environment and jewelry coordination. If it was like the all black larger version it would be too tacti-cool for some settings. It's super light and it reads well. This watch definitely fulfills every bit of its specs, advertising and online appearance. Sometimes it's hard to tell how a watch will look in person and on the wrist but this one was spot on. If you are liking it but are unsure, spring for it. It meets the hype, and some.

### ⭐⭐⭐⭐⭐ Rugged but elegant
*by H***R on September 23, 2025*

Beautiful watch and works great.

### ⭐⭐⭐⭐⭐ Review
*by W***A on February 1, 2026*

muy bueno, es liviano, con la calidad de casio

## Frequently Bought Together

- G-Shock GMAS2100-1A
- G-Shock GA-2100 Series Watch

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**Shop now:** [https://www.desertcart.jp/products/686053467-gmas2100-1a](https://www.desertcart.jp/products/686053467-gmas2100-1a)

---

*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-02-28*