Casio G-Shock GMW-BZ5000RC-1 Full-Metal Watch with Rainbow Ion-Plated Case

The Casio G-Shock GMW-BZ5000RC-1 represents a high-water mark for the iconic "Square" 5000 series, blending decades of shock-resistant heritage with futuristic materials and manufacturing techniques. Launched in early 2026, this model is part of the GMW-BZ5000 sub-series, which serves as a significant structural and technological evolution of the legendary full-metal GMW-B5000.

Design of the Watch

The core concept of the GMW-BZ5000RC-1 is "Brilliance in Strength." It aims to bridge the gap between G-Shock’s rugged origins and the pinnacle of modern luxury metal processing. For this specific reference, Casio drew inspiration from the vibrant, shifting colors of a spectrum, utilizing a "Rainbow Metal" design language. Notably, Casio integrated artificial intelligence into the development process, using decades of shock-resistance data to optimize the watch’s complex interlocking internal structure.


The design is defined by an intricate, multi-component full-metal exterior that sets it apart from previous "square" models. Specifically, the GMW-BZ5000 features a bezel and center case that connect only at the top and bottom, leaving the sides partially exposed to showcase a stunning color gradient.


This center case boasts a striking rainbow ion-plated (IP) finish, which is further complemented by the addition of gold-colored IP screws on the front bezel. To achieve this look, the metal surfaces undergo a rigorous process of forging, cutting, and polishing that results in a sophisticated mix of hairline and mirror-finish textures.

The display dial follows this aesthetic theme by utilizing rainbow vapor deposition on the glass to mirror the gradient effect of the case. Additionally, it features a high-contrast Memory in Pixel (MIP) LCD that offers superior readability and allows users to switch between "Standard" and "Classic" digital font styles.

Technical Specifications

Regarding its technical build, the case measures 49.3 mm in length and 43.6 mm in width, featuring a relatively slim thickness of 13 mm. This structure carries a substantial, premium weight of approximately 172 grams, lending it a solid presence on the wrist. For durability, the watch maintains a professional standard of 200-meter (20 ATM) water resistance, making it suitable for diving and high-impact water sports.
The face is protected by mineral glass that has been treated with rainbow vapor deposition for added aesthetic brilliance, while the underside features a robust screw-lock case back. This case back is finished with a diamond-like carbon (DLC) coating, which ensures both a tight seal and enhanced scratch resistance.
The timepiece is fitted with a solid stainless steel band featuring a one-touch 3-fold clasp. The bracelet links are precisely machined to match the watch's geometric aesthetic, ensuring that the GMW-BZ5000RC-1 feels as much like a piece of high-end jewelry as it does a nearly indestructible piece of horological engineering.

Functions and Features

Beyond its striking looks, the GMW-BZ5000RC-1 is a highly functional tool that features a high-contrast MIP LCD display for detailed rendering of dual time displays, the date, and the day of the week. It offers expansive global connectivity with access to 38 time zones and approximately 55 cities through the dedicated smartphone app.

For precision tracking, the watch includes a 1/100-second stopwatch and a 24-hour countdown timer, complemented by five daily alarms with a convenient snooze function. Finally, it ensures perfect visibility in any environment with white LED backlight that features a selectable duration.

The watch is powered by a Tough Solar technology, which converts light from any source into energy. To ensure absolute precision, it features Multi-Band 6 radio-controlled timekeeping and Bluetooth Smartphone Link connectivity. Through the Casio Watches app, the watch automatically adjusts to local time and allows for easy configuration of world time cities, alarms, and reminders.

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