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The G-SHOCK GMA-P2100ST gives the compact 2100 line a softly matted metallic-color dial; the GMA-P2100 offers a monochromatic resin-based alternative. The metallic description is about the dial’s color and finish—not a claim that the dial or watch is made of metal. Casio lists the ST series’ core functions, but its official pages do not establish that the finish changes how the watch works.
What “metallic dial” means on the GMA-P2100ST
Casio describes the GMA-P2100ST as having “Matte-finish pearlescent polarized coatings” on the bezel and band, with “softly matted metallic colors” on the dial. It also describes the dial as half-matte with subtle luster. That wording indicates a visual finish and color; it does not identify a metal dial plate.
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The bezel and band are resin components, with Casio describing key components as bio-based resin. Casio notes that the pearlescent appearance of the bezel and band can vary with viewing angle. The listed ST color variants are GMA-P2100ST-4A, GMA-P2100ST-7A, and GMA-P2100ST-9A. Casio’s GMA-P2100ST series page
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The GMA-P2100 is a useful comparison if you want a compact 2100-style watch without the ST’s metallic-color treatment. Casio describes its design as monochromatic, using different shades of one color across the case, band, dial, indexes, and hands. Its face has light and dark contrast, and Casio says it omits the inset dial found on earlier related designs. The case and bezel are listed as resin / bio-based resin, and the band as bio-based resin. Casio’s GMA-P2100 product page
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| Model | Dial and overall look | What the material listing establishes |
|---|---|---|
| GMA-P2100ST | Softly matted metallic-color dial; pearlescent polarized coatings on bezel and band | Casio describes resin-based bezel and band components; metallic refers to dial color and finish, not an identified metal dial component |
| GMA-P2100 | Monochromatic color scheme, with contrasting shades across the face and watch | Case and bezel listed as resin / bio-based resin; band listed as bio-based resin |
Size, weight, and what the published comparison can tell you
Casio lists the GMA-P2100 at 46 × 40.2 × 11.2 mm and 40 g. Those are published specifications for that model, not a direct measurement comparison with the GMA-P2100ST. Casio’s regional 2100-series chart gives context for other models: the GMA-S2100 is 46.2 × 42.9 × 11.2 mm and 41 g, while the metal-covered GM-S2100 is 45.9 × 40.4 × 11 mm and 55 g. These family figures should not be treated as specifications for either P2100 model. Casio Middle East and Africa’s 2100-series comparison chart
For fit, check the dimensions and band compatibility on the exact regional listing for the suffix you are considering. The available official comparison does not supply a complete direct GMA-P2100ST-versus-GMA-P2100 specification table.
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Do the metallic and monochromatic versions work differently?
Casio lists shock resistance, 20-bar water resistance, world time, a 1/100-second stopwatch, countdown timer, five daily alarms, hand shift, and double LED light for the GMA-P2100ST series. These are manufacturer-listed specifications, not independent test results. GMA-P2100ST specifications
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchThe GMA-P2100’s product page lists its own functions, including 31 time zones, a countdown timer, and five daily alarms. It also specifies approximately three years of battery life using a CR1025 cell. Check the exact product and regional page for the full feature list: series-level similarities do not guarantee that every specification is identical across SKUs. GMA-P2100 specifications
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The official pages do not say that the ST’s dial finish changes the watch’s functions. Choose between these models primarily on appearance, then verify the exact SKU’s specifications if a particular feature matters.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which one should you choose?
- Choose the GMA-P2100ST if you want a compact watch with metallic color on the dial and a pearlescent treatment on the bezel and band. Casio lists the -4A, -7A, and -9A variants; check your local listing for the specific colorway and availability.
- Choose the GMA-P2100 if you prefer a more uniform, monochromatic color scheme and want a listed weight and dimensions to use as a reference: 40 g and 46 × 40.2 × 11.2 mm.
- Check the exact model page before buying if fit, battery life, or a particular function is decisive. Published family-chart figures are not a substitute for the specifications of the precise P2100 suffix.
Casio’s descriptions establish the intended finishes and listed specifications, but do not establish real-world legibility, comfort, scratch resistance, or how well either finish holds up with wear. Current prices and stock are not stated on the cited product pages.
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