The 40th anniversary Adventurer’s Stone shock-resistant models are inspired by the stones known to adventurers as useful compasses since the Middle Ages. The G-SHOCK brand concept of continuous innovation inspires people to take on new challenges, and the design of this line is based on the value that these stones have always had to people seeking adventure. This model begins with the GM-S2100 and incorporates a design inspired by yellow-gold calcite. The bezel is treated with ion plating in gold, while vapour deposition gives the dial and hour markers a similar colour to recreate the clear yellow of this form of calcite.