The tourmaline’s name is derived ... Highly prized for its lagoon blue colour rather than its clarity, demand for the stone sent prices escalating to $2,000 per carat at gem shows around the ...

The gem comes in a range of colors, such as pink, red, green, blue, violet and black. This is fitting since tourmaline's name derives from the Sinhalese word "toramalli," which means "stone with ...