• Casio G-SHOCK 2100 Series GA2100HDS-7A – white and blue ‘CasiOak’ design with phosphorescent dial, Carbon Core Guard structure, 200m water resistance, and summer-sea inspiration.
  • Casio G-SHOCK 2100 Series GA2100HDS-7A – white and blue ‘CasiOak’ design with phosphorescent dial, Carbon Core Guard structure, 200m water resistance, and summer-sea inspiration.
  • Casio G-SHOCK 2100 Series GA2100HDS-7A – white and blue ‘CasiOak’ design with phosphorescent dial, Carbon Core Guard structure, 200m water resistance, and summer-sea inspiration.
  • Casio G-SHOCK 2100 Series GA2100HDS-7A – white and blue ‘CasiOak’ design with phosphorescent dial, Carbon Core Guard structure, 200m water resistance, and summer-sea inspiration.
  • Casio G-SHOCK 2100 Series GA2100HDS-7A – white and blue ‘CasiOak’ design with phosphorescent dial, Carbon Core Guard structure, 200m water resistance, and summer-sea inspiration.
  • Casio G-SHOCK 2100 Series GA2100HDS-7A – white and blue ‘CasiOak’ design with phosphorescent dial, Carbon Core Guard structure, 200m water resistance, and summer-sea inspiration.
  • Casio G-SHOCK 2100 Series GA2100HDS-7A – white and blue ‘CasiOak’ design with phosphorescent dial, Carbon Core Guard structure, 200m water resistance, and summer-sea inspiration.
  • Casio G-SHOCK 2100 Series GA2100HDS-7A – white and blue ‘CasiOak’ design with phosphorescent dial, Carbon Core Guard structure, 200m water resistance, and summer-sea inspiration.
  • Casio G-SHOCK 2100 Series GA2100HDS-7A – white and blue ‘CasiOak’ design with phosphorescent dial, Carbon Core Guard structure, 200m water resistance, and summer-sea inspiration.
  • Casio G-SHOCK 2100 Series GA2100HDS-7A – white and blue ‘CasiOak’ design with phosphorescent dial, Carbon Core Guard structure, 200m water resistance, and summer-sea inspiration.
  • Casio G-SHOCK 2100 Series GA2100HDS-7A – white and blue ‘CasiOak’ design with phosphorescent dial, Carbon Core Guard structure, 200m water resistance, and summer-sea inspiration.
  • Casio G-SHOCK 2100 Series GA2100HDS-7A – white and blue ‘CasiOak’ design with phosphorescent dial, Carbon Core Guard structure, 200m water resistance, and summer-sea inspiration.
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CASIO

G-SHOCK GA2100HDS-7A

G-SHOCK GA2100HDS-7A

$110.00 USD
$110.00 USD $110.00 USD
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Casio G-SHOCK 2100 Series – Model GA2100HDS-7A

The GA2100HDS-7A draws its inspiration from the summer seas, combining the beloved octagonal GA2100 design with an oceanic palette of white and blue. This model captures the beauty of the coast — from the brilliant glow of daylight to the serene shimmer of nighttime hues.

Design Overview

The GA2100HDS-7A features a blue phosphorescent dial that softly glows at night, evoking the mystical shimmer of bioluminescent plankton floating in the sea. Paired with a crisp white and blue color scheme, the design reflects the dynamic transformation of the beach, shifting from bright sunlight to soft, dreamy nighttime tones.

Its lightweight bio-based resin band and Carbon Core Guard structure ensure both comfort and G-SHOCK’s legendary durability, making it equally suited for casual outings and everyday wear.

Key Highlights

✔ Fresh white & blue color scheme inspired by summer seas
✔ Blue phosphorescent dial for a subtle night glow effect
✔ Carbon Core Guard structure for light yet powerful durability
✔ Double LED (Super Illuminator) for clear visibility day or night
✔ 200-meter water resistance for reliable performance

Features & Specifications

Case & Band

  • Case Size: 48.5 × 45.4 × 11.8 mm

  • Material: Carbon / Bio-based resin

  • Band: Bio-based resin band

  • Weight: 51 g

Exterior

  • Glass: Mineral Glass

  • Other: Neobrite luminous coating

  • Compatible Band Size: 145–215 mm

Water Resistance

  • 200-meter water resistance

Timekeeping & Functions

  • World Time: 31 time zones (48 cities + UTC), daylight saving on/off

  • Stopwatch: 1/100-second stopwatch, elapsed time, split time, 1st–2nd place times

  • Timer: Countdown timer (1 second–24 hours)

  • Alarms: 5 daily alarms + hourly time signal

  • Calendar: Full auto-calendar (to year 2099)

  • Format: 12/24-hour format

  • Accuracy: ±15 seconds per month

Lighting

  • Light: Double LED (Super Illuminator – one for the face, one for the digital display)

  • Light Color: White

  • Afterglow: Selectable illumination (1.5 or 3 seconds)

Battery & Power

  • Battery Type: SR726W × 2

  • Battery Life: Approx. 3 years

Summary

The GA2100HDS-7A is a fresh, sea-inspired take on the iconic GA2100 “CasiOak” design. With its phosphorescent blue dial, Carbon Core Guard durability, and stylish white-and-blue palette, this model moves effortlessly from beach days to casual work settings — all while staying true to G-SHOCK’s spirit of toughness.

For more details, visit the official G-SHOCK website here.


Warranty:

  • The watch is covered by a warranty, providing assurance and protection for your purchase.

▶︎Processing Time & Shipping Policy

▶︎Refund policy

▶︎We only carry G-SHOCK USA products.

▶︎Unfortunately, we DO NOT ship internationally.

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CASIO G-SHOCK COLLECTION

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Gshock, Casio, Made in Japan

Explore Your Favorite G-SHOCK Watches

Explore our current selection of G-SHOCK watches. If you don’t see your preferred model, check the G-SHOCK USA website, note the model number, and contact us via email or phone(415-567-2400) to place your order. Ask about our special deals!

Please note:

  • We only carry G-SHOCK USA products.
  • Unfortunately, we DO NOT ship internationally.
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Trusted Since 1967

Our owner, Asuka Saito, is certified by both Gemological Institute of America (GIA) and Cultured Pearl Association of America (CPAA), and we also have a GIA-certified appraiser on staff. Asuka is also a color specialist, certified as a TC Color Therapist and Sensational Color.

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