– Compact 5600 frame: slimmer GM-S variant at 43.8 × 38.4 × 10.9 mm and 50g, designed for smaller wrists.
– Iridescent rainbow glass: individually graded vapor-deposited glass for each unit, marketed as a deliberate feature.
– Subtle, all-black aesthetic with XG branding: black bezel and bio-based resin band, quiet XG logos on dial, band loop, and case back.
– Core G-Shock specs: 200m water resistance, shock resistance, 3-year CR1616 battery, Super Illuminator, full auto-calendar to 2099.
– Limited/pricier collaboration: multiple colorways (including pink), enhanced build (metal bezel anticipated), sale set for June 2026 with pricing above standard 5600.
Casio Unveils GM-S5600XG-1 with XG Collaboration
Casio is dropping the GM-S5600XG-1 in June, and it’s one of the more interesting G-Shocks they’ve put out in a while. It’s a collaboration with XG — a seven-member international artist group that teeters between both J-POP and K-POP — and the design is meant to reflect that. the approach blends streetwear vibes with classic G-Shock resilience, aiming to attract fans of both music scenes and horology alike.
Compact 5600 Frame and Unique Glass
The watch is built on the 5600 frame, the same square silhouette that goes back to the original G-Shock, but this is the slimmer GM-S variant for smaller wrists. At 43.8 × 38.4 × 10.9 mm and 50g, it’s significantly more compact than the standard 5600. The major highlight here is the glass, which goes through a rainbow vapor deposition process — and because it’s applied individually, every single unit comes out with a slightly different gradation of color. Casio is marketing that as a feature rather than a flaw.
Design and Colorway Details
The rest of the design is as low-key as it gets: all-black bezel, black bio-based resin band, with the XG logo quietly stamped on the dial, band loop, and case back. There are multiple colorways/models in the lineup, including a new pink variant, but this black version with the iridescent display is the one that should get more attention, at least online.
Spec Highlights and Practical Facts
Spec-wise it’s straightforward G-Shock: 200-meter water resistance, shock resistance, 3-year battery life on a CR1616, Super Illuminator backlight, and a full auto-calendar running to 2099.
Pricing and Availability
No price has been confirmed yet, but given the collab positioning and metal bezel construction, we can expect it to sit above the standard 5600 entry price. It goes on sale June 2026.
Important Note for Readers
Casio










