A handheld spectroscope for visible light shows the absorption lines of the elements involved in producing its color. Spectroscope breaks up the light that is being transmitted from a gemstone to its spectral colors. The process allows the gemologist to see the various wavelengths absorbed by the gemstone. Spectroscopes allows you to analyze a loose or mounted stone's spectrum. They help distinguish naturally colored diamonds from those that have been irradiated and help to distinguish natural stones from synthetics by the stone's selective absorption of certain wavelengths. Features: Heavy duty and precise Made of Aluminum With Prism type inside instruction Durable, reliable and made by professional craftsmen Specifications: Length: 130mm Diameter: 20 mm Material: Aluminum (Heavy Duty) Inside Instruction: Prism Type Set Includes: 1 x Spectroscopes 1 x Carrying Pouch