The G-Shock development team responsible for the new collection tells WIRED the fundamental challenge was building a “near-unbreakable” watch using an inherently brittle material. Making watch cases from sapphire is not new in the high-end watch world, and many distinguished makers, including Richard Mille and Hublot, have released pieces made of the crystal.

To make the sapphire case work for a G-Shock, however, Casio had to develop a brand-new, dedicated shock-resistant structure, with the Multi-Guard construction using virtually invisible seams, alongside a completely screwless assembly method to hit the required shock performance. To do this, the outer case assembly required the development of completely new, dedicated jigs and fixtures, a process apparently so demanding that only one person at Yamagata Casio (the primary “mother factory” for Casio) can currently perform it.

All three new watches, along with the proper G-Shock resistance to knocks and drops, are water-resistant to 200 meters, solar-powered, and feature radio-controlled timekeeping, world time, stopwatch, countdown timer, five daily alarms, and a full-auto LED backlight.

If the $80K G-Shock is too steep an investment, the MRG-B5000SA-2 with two two-carat facet-cut blue sapphires and a grade-5 titanium exterior is limited to 500 pieces. The cheapest GMW-B5000SB-1A2 marries a full-metal black exterior with four round brilliant-cut blue sapphires.