Casio’s compact corner of the G-Shock catalog just picked up two more colorways, and they’re aimed squarely at wrists that find the brand’s classic square a bit much. The GMD-B300-2 arrives in a deep navy with a vapor-deposition sheen on the glass, and the GMD-B300-7 lands in off-white with metallic printing on the crystal. Both ship with the same step-counting brain that’s been in the GMD-B300 line since launch, and both list at $135 on Casio’s US store.
Price: $135
Where to Buy: Casio US
If you’ve been watching this series since it first surfaced, you’ll know the case is one of Casio’s smaller G-Shock squares, sitting between the standard 5600 and the even more compact GMD-S5600. It measures around 43.8mm wide, which is a noticeable trim from the 5600-series it’s clearly inspired by. Casio markets the watch as one that “comfortably fits even slimmer wrists,” and the brand has the GMD-B300 sitting in its women’s digital section on the dedicated G-Shock site.
What’s actually new in this drop
The GMD-B300 line isn’t fresh on paper. Casio rolled out the family in 2024 with the black GMD-B300-1, the GMD-B300-3, and the pink GMD-B300-4, then added the spring-toned GMD-B300SC sub-line in 2025. The -2 and -7 are the 2026 additions, first showing as the -2JF and -7JF in Japan ahead of the US sale, which kicked off May 8, 2026. The new bit is that both colorways are now live on the US storefront at the same $135 sticker as the rest of the line.
Casio also calls out that the case and band are made with bio-based resin, the same eco-resin story the brand’s been telling on a handful of recent G-Shock releases. It’s not a feature most buyers will pick this watch for, but it’s a small note in the sustainability column.
The step tracker, the Bluetooth, and the G-Shock fundamentals
The -2 and -7 carry over the full feature set of the line. There’s a motion-sensing accelerometer that starts counting your steps automatically once you walk, a daily step total readout, and a goal-progress display that nudges you toward whatever target you’ve set in the app. Casio’s Smartphone Link is built in over Bluetooth, so the watch syncs with the Casio Watches app for goal management and a basic history view.
You also get the shock-resistant chassis the badge has stood for since 1983. Pair that with the smaller case, and the GMD-B300 reads less like a fitness tracker and more like a daily-wear digital that happens to count your steps.
I’ll be straight: this isn’t a watch that’s going to draw a crowd at a watch meetup. That’s the point. It’s built for people who want G-Shock character on a smaller wrist, with a step layer that’s a practical bonus rather than a real fitness platform.
Why these two colorways matter more than the launch suggests
The black GMD-B300-1 reads as the default. The pink -4 leans playful. The new GMD-B300-2 and GMD-B300-7 slot into wardrobe spaces the line hasn’t really covered yet, and they’re the ones I’d actually consider buying.
The navy -2 has a deep, monochromatic cast, and the vapor-deposition treatment on the crystal gives it a subtle shimmer that’s rare for a G-Shock under $150. The off-white -7 is the more interesting of the pair in my opinion: pure white G-Shocks tend to yellow over time, and an off-white finish builds that warmth in from day one. If you’ve ever wanted a G-Shock that doesn’t read as gym gear, the -7 might be one of Casio’s most quietly wearable digital squares of the year.
How it stacks against the GMD-S5600
The obvious cross-shop is the GMD-S5600, the slightly smaller compact 5600 that’s been around for a few years. The GMD-S5600 skips both the step counter and the Bluetooth link , so it’s a purer digital play if those layers don’t matter to you. It also lists for around $99, well under the GMD-B300’s $135.
If you don’t care about the app sync, the GMD-S5600 is the cheaper move. If you want the connected step layer in a smaller G-Shock case, the -2 or -7 is the pick at $135.
Pricing and availability
Price: $135
Where to Buy: Casio US, Amazon (Black)
Both colorways are listed at $135 on Casio’s US site. If you’re shopping outside the US, you’ll want to check your local Casio storefront, since regional sub-references (the -2JF in Japan, for instance) carry different pricing: Japan lists at ¥17,600 (roughly $113), well under the US $135.
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(as of May 13, 2026 18:52 GMT -05:00 - More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)
