Chart your own course with a G-SHOCK 40th Anniversary Adventurer’s Stone limited-edition timepiece. Join us in celebrating the G-SHOCK 40th by choosing one of these spectacular metal-clad watches, which are inspired by the stones adventurers have used to navigate since ancient times. The special colors of the minerals ancient seafarers used to find their way are reproduced in these watch designs with forging, ion plating, and masking processes, giving each metal bezel a one-of-a-kind look. The bands are made with colored or translucent resin and are uniquely textured with hot-stamping and Grail color molding techniques. These limited-edition timepieces celebrate the G-SHOCK 40th through and through: the phrase “SINCE 1983” appears on the dial; the Eric Haze-designed 40th logo is engraved on the case back, and there are four stars for 40 on the band loop.


The GM-5640GEM-1 watch is a stunning and luxurious accessory from Casio’s G-Shock collection. With its exquisite design and exceptional craftsmanship, this timepiece offers the perfect blend of style and sophistication.

Crafted with high-quality materials and featuring a durable construction, the GM-5640GEM-1 watch is built to withstand the test of time. It showcases a sleek black case adorned with sparkling gemstones, adding an elegant and glamorous touch to your wrist.

This watch is equipped with advanced features that enhance your daily life. It includes multi-functionality such as world time, allowing you to keep track of time across different time zones. The stopwatch feature enables precise timing, while the alarm function ensures you stay punctual and on schedule.



      • Case size (L× W× H)

        49.6 × 43.2 × 12.9 mm
      • Weight

        78 g
      • Case and bezel material

        Case / bezel material: Resin / Stainless steel
      • Band

        Resin Band
      • Construction

        Shock Resistant
      • Water resistance

        200-meter water resistance
      • Power supply and battery life

        Approx. battery life: 2 years on CR2016
      • Warranty period

        2 years
      • Country Of Origin



      Mineral Glass
    • Surface treatment

      Black ion plated bezel
      Rainbow ion plated bezel
    • Compatible band size

      145 to 215 mm



    1/100-second stopwatch Measuring capacity: 00’00”00~59’59”99 (for the first 60 minutes) 1:00’00~23:59’59 (after 60 minutes) Measuring unit: 1/100 second (for the first 60 minutes) 1 second (after 60 minutes) Measuring modes: Elapsed time, split time, 1st-2nd place times
  • Timer

    Countdown timer Measuring unit: 1 second Countdown range: 24 hours Countdown start time setting range: 1 second to 24 hours (1-second increments, 1-minute increments and 1-hour increments) Other: Auto-repeat
  • Alarm/hourly time signal

    Hourly time signal
    Multi-function alarm
  • Flash alert feature

    Flash alert Flashes with buzzer that sounds for alarms, hourly time signals
  • Light

    Electro-luminescent backlight Afterglow
  • Light color

    EL:Blue Green
  • Calendar

    Full auto-calendar (to year 2099)
  • Accuracy

    Accuracy: ±15 seconds per month
  • Other features

    12/24-hour format
    Regular timekeeping: Hour, minute, second, pm, month, date, day

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