Search  for anything...
G-Shock

GMAS2100-1A

  • Based on 264 reviews
Condition: New
Checking for the best price...
$95.97 Why this price?
Save $6.98 was $102.95

Buy Now, Pay Later

As low as $16.00 / mo
  • – 6-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Free shipping on this product

FREE 30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: Only 6 left in stock, order soon!
Fulfilled by Amazon
Arrives Tuesday, Sep 22
Order within 23 hours and 53 minutes
Available payment plans shown during checkout
Protection Plan Protect Your Purchase
Checking for protection plans...

Recently Viewed

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

Product Dimensions ‏ : ‎ 8 x 5 x 5 inches; 4.8 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: #248,793 in Clothing, Shoes & Jewelry (See Top 100 in Clothing, Shoes & Jewelry) #550 in Women's Wrist Watches


#550 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)


Bezel Color: Black


Character: fashion


Brand Name: G-Shock


Model Name: Casio G Shock


Included Components: Band


Model Number: GMAS2100-1A


Series Number: 2100


Item Weight: 4.8 ounces


Unit Count: 1 Count


Model Series: GMAS2100


Manufacturer: G-Shock


Number of Items: 1


UPC: 889232300252


Age Range Description: Adult


Item Type Name: Sport Watch


Manufacturer Part Number: GMAS2100-1A


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: Tuesday, Sep 22

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.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • 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
    • Great
Review Image by Alacr1cy
Great, just didn’t come with the original box, but it’s an original watch
Reviewed in the United States on June 25, 2026 by Alacr1cy
    • ez to use and looks good
fire
Reviewed in the United States on July 31, 2026 by Steven M.
    • 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
    • Casios are great
I reallh like the color combination. It makes for a subtle yet visually attractive time piece
Reviewed in the United States on September 14, 2026 by Will Wright
    • 200m water resistance. Strap broke first swim
This was my first G-shock. I bought it to go camping with my son. First swim in the lake, I felt it detach on the top of my wrist and I saw it drift down to the bottom. This is NOT a well made watch. I’m sure the thing will tell perfect time for 10 years on the bottom of this lake but I spent 100 bucks on wearing a watch for 8 hours. NOT a well made watch. ... show more
Reviewed in the United States on July 30, 2026 by William C Paddock
    • Bonito Reloj para mujer
Reloj para mujer
Reviewed in the United States on August 10, 2026 by Camilo Vasquez
    • Women size
A Perfect woman size GShock
Reviewed in the United States on July 1, 2026 by Sean Chon McCall

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...