Pair of Tourmaline Bicolor Rectangular 12.5X10

Bicolor tourmaline is a variety of tourmaline that displays two distinct colors in a single crystal. This phenomenon is known as pleochroism, which is the ability of a mineral to display different colors when viewed from different angles. In the case of bicolor tourmaline, the colors are usually distributed in distinct zones throughout the crystal, resulting in a stone with a gradual transition or clear division between the colors.