Handheld Gem Spectroscope | Gemstone Spectral Analysis Tools

Handheld Gem Spectroscope, FPS-3

Diameter	18mm
Length	75mm
Net weight	36g
Packaging	Outer cardboard box with an inner leather case

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Features

Prism-based spectroscope that provides detailed spectral analysis

Fixed focus design ensures stable and consistent observations

No engraved scale

High-resolution with a black-coated exterior to minimize light reflection and interference

Triple-prism imaging system

Non-uniform wavelength spectrum, enhancing the visibility of darker blue-violet regions.

The spectral bands are unevenly spaced, with the blue-violet region appearing wider and the red region compressed.
Higher transmission for a brighter spectral display.
Resolution in the red spectrum is slightly lower than in the blue-violet region. The focal distance may vary slightly depending on the gemstone’s color.

Gem spectroscopes uses a dispersive element (either a prism or a diffraction grating) to separate white light into different wavelengths, creating a visible light spectrum. Various elements and compounds present in gemstones, such as transition metals, rare earth elements, and radioactive elements, selectively absorb specific wavelengths of light. By analyzing these absorption spectra, gemologists can identify gemstone types, determine their coloring agents, and study the composition of their color properties.

Applications

Suitable for colored gemstones, as most colorless stones do not display distinct absorption spectra, with exceptions like zircon, diamond, and andesine-labradorite.
Used for identifying gemstones with distinctive spectral patterns, including almandine garnet, ruby, sapphire, jadeite, peridot, kornerupine, zircon, cobalt glass, and synthetic cobalt spinel.
Gemstones with characteristic spectra can serve as diagnostic identification markers. For example, almandine garnet exhibits an iron-aluminum absorption window, natural green jadeite has a 437nm absorption line, and certain gemstones display a series of distinct absorption bands in the red region.

Transmission light method

Internal reflection method

Surface reflection method

Absorption Spectrum

Absorption spectrum of almandine garnet

Absorption spectrum of emerald

Absorption spectrum of ruby

Absorption spectrum of peridot

Spectral Diagram

A prism spectroscope produces a non-uniform wavelength spectrum

A diffraction grating spectroscope generates a uniform wavelength distribution.