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G-Shock

GMAS2100-1A

  • Based on 198 reviews
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Availability: Only 1 left in stock, order soon!
Fulfilled by Amazon
Arrives Monday, Mar 30
Order within 22 hours and 36 minutes
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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

Is Discontinued By Manufacturer ‏ : ‎ No


Product Dimensions ‏ : ‎ 8 x 5 x 5 inches; 5.29 ounces


Item model number ‏ : ‎ GMAS2100-1A


Department ‏ : ‎ Watches


Batteries ‏ : ‎ 1 LR44 batteries required.


Date First Available ‏ : ‎ March 18, 2021


Manufacturer ‏ : ‎ G-Shock


Product Warranty: For warranty information about this product, please click here


Best Sellers Rank: #825,352 in Clothing, Shoes & Jewelry (See Top 100 in Clothing, Shoes & Jewelry) #2,280 in Women's Wrist Watches


Display: Analog-Digital


Watch Movement Type: Japanese Quartz


Additional Features: Shock Resistant, Timer, World Time, light, stop-watch


Power Source: Battery Powered


Strap Type: Two Piece Strap


Water Resistance Depth: 30 Meters


Sport Type: Multi-Sport


Clasp Type: Buckle


Water Resistance Level: Water Resistant


Embellishment Feature: Crystal


Closure Type: Buckle


Style Name: Watches


Shape: Octagonal


Band Color: Black


Dial Color: Black


Theme: Sports


Pattern: Solid


Face Style: Crosshair (possible other styles Teaked, Linen)


Character: fashion


Brand Name: G-Shock


Model Name: Casio G Shock


Included Components: Band


Model Number: GMAS2100-1A


Series Number: 2100


Manufacturer: G-Shock


UPC: 889232300252


Manufacturer Part Number: GMAS2100-1A


Unit Count: 1 Count


Age Range Description: Adult


Item Type Name: Sport Watch


Band Material Type: Resin


Case Material Type: Carbon/Resin


Crystal: mineral


Case Diameter: 42 Millimeters


Band Width: 24


Case Thickness: 11 Millimeters


Bands: 1


Warranty Type: Manufacturer


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Mar 30

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • G-shock with style.
It is an elegant G-Shock, nothing fancy but it has its own style for sure.
Reviewed in the United States on March 5, 2026 by Amazon Customer
    • 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. ... show more
Reviewed in the United States on July 14, 2021 by averageguy
    • Chévere
Review Image by Diana vargas
Es liviano y cumple con todas las expectativas
Reviewed in the United States on March 15, 2026 by Diana vargas
    • miy buen reloj
Review Image by wilson ardila
muy bueno, es liviano, con la calidad de casio
Reviewed in the United States on February 1, 2026 by wilson ardila
    • Very cool
Review Image by RRZR
It’s a very nice watch. Friend made fun of me that it’s very army vibe but I like that. If you are buying it for the digital aspect it’s very tiny. The analog is more prominent and the digital time is small sometimes even hard to tell if the time hands are blocking it To set the time I had to YouTube it; after a few tries I figured it out. I only took off one star because the digital Time is smaller than expected I really love the watch and plan to wear it for daily use Was also surprised the date was accurate when I turned it on ... show more
Reviewed in the United States on October 15, 2024 by RRZR
    • Rugged but elegant
Beautiful watch and works great.
Reviewed in the United States on September 23, 2025 by Holly Baker
    • Not what is looks like
Looks better online. Small face and hard to read date.
Reviewed in the United States on January 24, 2026 by Tim Holmes
    • A nice unisex size. Pink Gold Batons and Hands are a concern
I like the size of this watch which is promoted as a women's watch but is also unisex. I have small wrists and prefer the unisex/smaller Casio. This one looked styled for a unisex appeal. The hands and batons are a pink gold that stand out from the face. It definitely has a female appeal. I looking for a unisex Casio, think twice before this purchase if you are a male. ... show more
Reviewed in the United States on August 24, 2023 by Homer

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