Long revered as a stone that swallows negative energy, black tourmaline is the dark that consumes darkness. It possesses pyroelectric properties, meaning it produces an actual electrical voltage when heated or cooled. This property was first noted because a 16th century scientist noticed that tourmaline would literally draw particles of ash towards it. Aquamarine invokes a sense of calm and purity. It was often carried by sailors as a talisman of protection. Burnished silver gives them an eye-catching modern edge.