A small wooden pendant held on a red piece of string. The wooden pendant has three gemstones set into it, one blue, one yellow, one green. The blue gemstone glows dimly in the presence of freshwater and brightly in the presence of saltwater. The green pendant glows brightly when underground and dimly when underground but above sea level – say, when in a mountain. Lastly, the yellow pendant glows brightly during the day and dimly during dawn and dusk.