StoreDeal.ai store
Shop
  • Deals
  • Deal checker
  • Black Friday
  • Buying guides
  • Brands
  • Stores
Travel
  • Flight deals
  • Hotel deals
Company
  • Research
  • Press
  • deal.ai apps
Black Friday 2026
  • Walmart
  • Best Buy
  • Target
  • TVs
  • Laptops
  • Headphones
  • Apple
  • Gaming
  • Vacuums
  • Kitchen
  • Toys
  • Smartwatches
  • Tablets
  • Furniture
  • Mattresses
© Deal.ai Inc.
TermsPrivacy
Deal.ai › Casio › Wrist Watches
Casio
Casio G-Shock Resin Black Digital Quartz Watch 45mm 20atm

Casio G-Shock Resin Black Digital Quartz Watch 45mm 20atm

4.6(48 ratings)

Best price now

$95.99at AmazonChecked 22 min ago

Compared across 3 stores. Prices are checked against each store and labelled with when. As an Amazon Associate, Deal.ai earns from qualifying purchases.

Visit Amazon

Ask our agent about this product

It checks today's price at every store, compares the alternatives and answers in about a minute.

Enter to send, Shift+Enter for a new line

Price facts

  • Lowest price today: $95.99 at Amazon (checked Nov 11, 2026).
  • Checked at 3 stores.

Our take on the Casio G-Shock Resin Black Digital Quartz Watch 45mm 20atm

The GA-2100 is Casio's slimmed-down G-Shock, often called the CasiOak for its octagonal bezel and near-luxury look. It mixes analog hands with a digital display and packs a stopwatch, countdown timer, world time, alarms and a full calendar into a carbon-core case that weighs about 1.8 oz. Water resistance is rated to 200 m, and the mineral glass and resin build shrug off knocks. It suits people who want a tough everyday watch that reads well with casual clothes, and it undercuts steel sports watches on durability while offering more functions than most analog rivals at its level.

Best forEveryday wear with casual or streetwearSports, swimming and outdoor useBuyers who want analog looks with digital functionsSmall to medium wrists that find full-size G-Shocks bulky
Pros
  • Slim carbon-core case wears smaller than classic G-Shocks
  • 200 m water resistance covers swimming and snorkeling
  • Analog hands plus digital display for time, date and timers
  • World time, stopwatch, countdown timer and multiple alarms
  • Mineral glass and resin build resist scratches and shocks
  • About 1.8 oz, light enough to forget on the wrist
Cons
  • Negative digital display can be hard to read in low light
  • Mineral glass is not sapphire and can pick up fine scratches
  • Resin strap and bezel feel plasticky to some owners
  • No solar charging or Bluetooth on this model
  • Hands can obscure the small digital window at certain times

Casio G-Shock Resin Black Digital Quartz Watch 45mm 20atm prices at every store

  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $95.99Free shippingChecked 22 min ago
    Visit Amazon
  • CASIONew

    Out of stock

    $99.00Free shippingChecked 22 min ago
    Visit CASIO
  • WalmartNew

    Out of stockSold by CW WATCHESReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.

    $121.71+ $14.00 shippingChecked 22 min ago
    Visit Walmart

Store links may earn us a commission. Some prices via Klarna.

Casio G-Shock Resin Black Digital Quartz Watch 45mm 20atm price history

$99.00$95.99
Nov 8Nov 11

Lowest price we've seen: $95.99 on Nov 11 at Amazon; highest $99.00 on Nov 8. Tracked across 2 stores since Nov 8.

What reviewers say

  • 4.6 / 548 ratings

Owners rate it highly, praising the slim fit, the octagonal look and the toughness for the money. Common complaints are the dim digital display and the plastic feel of the strap and bezel.

What people mention
  • Size and fitPraisedOwners say the slim case sits flat and suits smaller wrists better than full-size G-Shocks.
  • Display legibilityCriticisedThe negative digital display is described as hard to read in dim light.
  • Build feelMixedThe carbon core is praised for toughness, but the resin strap and bezel feel plasticky to some.
  • Water resistancePraisedBuyers trust the 200 m rating for swimming and water sports.
  • Glass durabilityCriticisedSome owners report fine scratches on the mineral glass with regular wear.

About the Casio G-Shock Resin Black Digital Quartz Watch 45mm 20atm

This is a Casio watch which has black for its dial color. Analog hands are combined with digital hands.

Specifications

Color (Strap)
BlackSource
Closure
BuckleSource
Glass
MineralSource
Watch Strap Material
ResinSource
Functions

Questions and answers

Is the GA-2100 good for swimming?
Yes. It is rated to 20 ATM (200 m), which covers swimming and snorkeling. Casio does not recommend it for scuba diving.
How does it compare with the classic square G-Shock?
The GA-2100 is slimmer and has analog hands plus a digital window. The square models are bulkier but often easier to read and some offer solar power.
Does it have a light for night reading?
Yes, it has an LED backlight for the digital display. The analog hands have luminous paint but no separate illumination.
What is in the box?
The watch, a resin strap already fitted, and a manual. No charging cable is needed since it runs on a coin-cell battery.
Can I change the strap?
Yes. The GA-2100 uses standard lug widths, so resin, nylon or aftermarket straps can be fitted.
Is it too big for a small wrist?
It is one of the smaller G-Shocks at 45 mm across, and owners with smaller wrists generally find it comfortable.
Where is the Casio G-Shock Resin Black Digital Quartz Watch 45mm 20atm cheapest?
At Amazon, for $95.99, as of our latest check.
Is the Casio G-Shock Resin Black Digital Quartz Watch 45mm 20atm at its lowest price?
Yes: $95.99 is the lowest price we've seen for it since November 8.
What do buyers say about the Casio G-Shock Resin Black Digital Quartz Watch 45mm 20atm?
Rated 4.6 out of 5 from 48 ratings.
Where can I buy the Casio G-Shock Resin Black Digital Quartz Watch 45mm 20atm?
3 stores we checked sell it, including Walmart, CASIO, Amazon.

More from Casio

  • C
    Casio G-Shock GA-2100-1AER
    Casio G-Shock GA-2100-1AER
  • C
    Casio G-Shock 2100 Series GA-B2100-1A Men's Watch
    Casio G-Shock 2100 Series GA-B2100-1A Men's Watch
  • C
    Casio G-Shock GA-B2100-1ACR CasiOak Solar Watch
    Casio G-Shock GA-B2100-1ACR CasiOak Solar Watch
  • C
    Casio G-Shock GM-S2100CB-5A Women's Analog Digital Watch
    Casio G-Shock GM-S2100CB-5A Women's Analog Digital Watch
  • C
    Casio G-Shock Camouflage Men's Watch
    Casio G-Shock Camouflage Men's Watch
  • C
    Casio G-Shock Metal GM-B2100AD-2AER Watch
Timer, Worldtimer, Luminous, Stopwatch, Alarm, DateSource
Gender
MaleSource
Series
Casio G-Shock GA-2100, Casio G-ShockSource
Case Color
Black, OrangeSource
Movement Type
QuartzSource
Type of Index
Index (without numbers)Source
Weight (oz)
1.799Source
Display Type
Digital, AnalogSource
Dial Color
BlackSource
Time Format
12 Hours, 24 HoursSource
Case Material
ResinSource
Water Protection
20 ATM (200m)Source
color
BlackSource
size
BlackSource
Casio G-Shock Metal GM-B2100AD-2AER Watch
  • C
    Casio G-Shock Classic
    Casio G-Shock Classic
  • C
    Casio G-Shock GA-B2100MF-1AER Men's Watch
    Casio G-Shock GA-B2100MF-1AER Men's Watch
  • All Casio deals and products →

    More men's watches

    • C
      Casio G-SHOCK GA-B2100BEG-1ADR 2100 Series Tough Solar Bluetooth Analog-Digital Black Electro Green Watch
      Casio G-SHOCK GA-B2100BEG-1ADR 2100 Series Tough Solar Bluetooth Analog-Digital Black Electro Green Watch
    • C
      Casio G-Shock Watch - GA-B2100-3ADR Black Dial, Green Band
      Casio G-Shock Watch - GA-B2100-3ADR Black Dial, Green Band
    • C
      Casio GA-B2100C-9A
      Casio GA-B2100C-9A
    • C
      Casio GA-B2100-1AJF G-Shock GA-B2100 Series Men's Rubber Band Watch
      Casio GA-B2100-1AJF G-Shock GA-B2100 Series Men's Rubber Band Watch
    • C
      Casio G-Shock GA-2100-7A7 Tone-on-Tone Analog Digital Watch
      Casio G-Shock GA-2100-7A7 Tone-on-Tone Analog Digital Watch
    • D
      Diesel Chief Chronograph Leather Watch
      Diesel Chief Chronograph Leather Watch
    • D
      Diesel Mega Chief Two-Tone Chronograph Watch
      Diesel Mega Chief Two-Tone Chronograph Watch
    • D
      Diesel Mr. Daddy 2.0 (DZ7395)
      Diesel Mr. Daddy 2.0 (DZ7395)