Watch A
Casio AQ-230GA-9
Round · 38.8mm
Optimal proportions for most wrists
Case: 38.8mmLug width: 18mmThickness: 8.1mm
Open this size in the full fit chart →Casio AQ-230GA-9 vs Casio G-Shock GA-2100
Side-by-side comparison of specifications and features
Key Differences
Best Value
Casio AQ-230GA-9 (AQ-230GA-9D)
Starting from $45
Best Water Resistance
Casio G-Shock GA-2100 (GA-2100-1A1)
200m (4x more)
Slimmest
Casio AQ-230GA-9 (AQ-230GA-9D)
8.1mm thick
Biggest Price Drop
Casio G-Shock GA-2100 (GA-2100-1A1)
-18.8% in 30 days
See Both Watches on Your Wrist
Set your wrist circumference to compare relative case presence. Lug-to-lug is included when the catalog has it.
Medium (6.7″)
Balanced
Watch B
Casio G-Shock GA-2100
Octagonal · 45.4mm · 47mm lug-to-lug
Bold statement piece
Case: 45.4mmLug-to-lug: 47mmLug width: 22mmThickness: 11.8mm
Open this size in the full fit chart →Proportional guide only: wrist shape, strap articulation, bezel design, and case curvature change how a watch actually wears. Non-round silhouettes use a verified family shape and catalog dimensions where available; missing case height or width is estimated from a conservative family aspect ratio.
Price Comparison
Casio AQ-230GA-9
MSRP
$45
New
$65
Used
$47
Casio G-Shock GA-2100
MSRP
$120
New
$111
Used
$86
MSRP New (Amazon) Used (eBay)
Side-by-Side Specs
Start with the specifications that meaningfully differ. Expand the complete table for reference details and missing-data context.
| Specification | Casio AQ-230GA-9 | Casio G-Shock GA-2100 |
|---|---|---|
| Pricing | ||
| MSRPAQ-230GA-9 is $75 less at MSRP | $45 | $120 |
| New PriceAQ-230GA-9 is $45.6 less based on the current snapshot | $65 | $111 |
| Used Price (Low)AQ-230GA-9 is $39.2 less at the low end | $47 | $86 |
| Used Price (High) | $155 | $895 |
| 30-Day Trend | ↑ +21.9% | ↓ -18.8% |
| Used Price Range | $47 - $155 | $86 - $895 |
| Identity | ||
| Style | Ana-Digi, Vintage, Casual | Ana-Digi, Sports, Tool |
| Dimensions | ||
| DiameterAQ-230GA-9 is 6.6mm smaller | 38.8mm | 45.4mm |
| ThicknessAQ-230GA-9 is 3.7mm thinner | 8.1mm | 11.8mm |
| Lug Width | 18mm | 22mm |
| Case | ||
| Water ResistanceG-Shock GA-2100 adds 150m water resistance | 50m (swimming) | 200m (diving) |
| Bezel | fixed | Fixed |
| Dial | ||
| Dial Color | gold | Black |
5 specifications both watches share
Release Era2010s
MovementQuartz
Case MaterialResin
CrystalMineral Crystal
Luminous✓ Included
1 field is excluded from the differences view because one watch lacks comparable data. Use “All specs” to inspect those gaps.
Which Should You Buy?
This Casio AQ-230GA-9 vs Casio G-Shock GA-2100 comparison is less about a universal winner and more about wrist presence versus easier fit, water-ready utility versus dressier everyday wear, entry price versus premium finishing or specs. Start with fit first — case width and lug-to-lug usually matter more than secondary features if wrist comfort is a concern.
Bottom line
Fit is a real separator here — compare case width and lug-to-lug before deciding, especially if wrist comfort matters more than headline features. Choose Casio AQ-230GA-9 if you want a smaller case footprint on the wrist; choose Casio G-Shock GA-2100 if you prefer more dial presence and a larger case feel.
Choose Casio AQ-230GA-9 when
Casio AQ-230GA-9 is a better fit for smaller wrists, low-maintenance daily wear, ana-digi styling.
Choose Casio G-Shock GA-2100 when
Casio G-Shock GA-2100 is a better fit for buyers who want more wrist presence, low-maintenance daily wear, ana-digi styling.
Key Differences
Movement and upkeep
Casio AQ-230GA-9: quartz movement
Casio G-Shock GA-2100: quartz movement
Both use the same movement type, so maintenance differences are limited and fit or feature details should decide the purchase.
Size and wearability
Casio AQ-230GA-9: 38.8mm
Casio G-Shock GA-2100: 45.4mm · L2L 47mm
Fit is a real separator here — compare case width and lug-to-lug before deciding, especially if wrist comfort matters more than headline features.
Water resistance
Casio AQ-230GA-9: 50m
Casio G-Shock GA-2100: 200m
Water resistance is a meaningful separator here — the higher-rated option gives more flexibility for swimming or rougher daily use.
Price and value
Casio AQ-230GA-9: $45
Casio G-Shock GA-2100: $111
There is a real price gap here — treat the more expensive option as an upgrade decision and confirm whether the extra spend buys something you will notice in weekly use.
Style and use case
Casio AQ-230GA-9: ana-digi
Casio G-Shock GA-2100: ana-digi
Both lean into a similar ana-digi use case — the choice is more about fit, features, and price than category.
Crystal and materials
Casio AQ-230GA-9: mineral crystal · resin
Casio G-Shock GA-2100: mineral crystal · resin
Materials are broadly similar, so finish, fit, and price will matter more than the materials list alone.
Choose Casio AQ-230GA-9 If...
- You want a smaller case footprint on the wrist.
- You want the lower current entry price.
Choose Casio G-Shock GA-2100 If...
- You prefer more dial presence and a larger case feel.
- Swimming, beach use, or tougher daily wear is part of the plan.
- You are comfortable paying more for a stronger feature set.
Price and Value Notes
Casio AQ-230GA-9 is often the value play at current pricing, while Casio G-Shock GA-2100 makes more sense if you will use its extra features regularly.
There is a real price gap here — treat the more expensive option as an upgrade decision and confirm whether the extra spend buys something you will notice in weekly use.
Where to Check Deals
Check current deals on Amazon and eBay using the buttons below — listing prices, seller quality, and condition can change quickly.
Check current deals on Amazon and eBay
Prices change often, so compare the latest listings and condition options before you buy.
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Casio AQ-230GA-9
Check Price on AmazonOpens in new tab · Price may vary
Check Price on eBayFrom $62 · New & used listings
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Casio G-Shock GA-2100
Check Price on AmazonOpens in new tab · Price may vary
Check Price on eBayFrom $104 · New & used listings
Affiliate links — WatchCompared earns a commission on qualifying purchases. This doesn't affect your price.
Comparison FAQ
Which one is better for smaller wrists?
Casio AQ-230GA-9 — it is 38.8mm wide versus 45.4mm. Thickness is 8.1mm vs 11.8mm, which also affects how it sits.
Which is better for swimming or rough daily wear?
Casio G-Shock GA-2100 — it is rated 200m versus 50m, which is the difference between swimming confidently and only handling splashes.
Is the more expensive one worth it?
Casio AQ-230GA-9 is the value pick at roughly $66 less. Pay more only if a specific difference above matters to you — otherwise the cheaper one is the smarter buy. Confirm live listings, since marketplace pricing moves.
Evidence & Method
How we compared these watches
No WatchCompared hands-on test claimed
- • Catalog specifications are normalized into the same units before differences are calculated.
- • The verdict uses only populated fields and the source-backed observations listed here.
- • Missing evidence reduces the depth of the conclusion instead of being filled with assumptions.
This page currently relies on normalized catalog fields and calculated differences. No external reviewer observation is used in its verdict.
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Casio AQ-230GA-9
Check Price on AmazonOpens in new tab · Price may vary
Check Price on eBayFrom $62 · New & used listings
Affiliate links — WatchCompared earns a commission on qualifying purchases. This doesn't affect your price.
Casio G-Shock GA-2100
Check Price on AmazonOpens in new tab · Price may vary
Check Price on eBayFrom $104 · New & used listings
Affiliate links — WatchCompared earns a commission on qualifying purchases. This doesn't affect your price.
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