Casio G-Shock REF; GMS5600GB1ERGo metal clad with a gold on black G SHOCK in a smaller, more compact profile. Finished in gold ion plating, the metal bezel says elegant luxe all the way. Buttons and buckle, also ion plated in gold, are set against a black for a contrast that makes the metal truly shine. The luxury of gold paired with the strength of black in a shimmery beauty that is uniquely you.