Gem Spectroscope | Gemstone Identification Tool

Handheld Gem Spectroscope, FGS-1A

Diameter	15mm
Length	55mm
Net weight	20g
Packaging	Outer cardboard box with an inner leather case

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Features

Diffraction grating spectroscope that separates light into precise wavelengths.

Adjustable focus for optimized visual clarity

No engraved scale

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

Diffraction grating and prism combined imaging

Evenly spaced wavelength spectrum, making it easier to distinguish absorption lines and details in the red-yellow region.

The spectral regions are evenly distributed, with all wavelengths arranged at equal intervals.
The resolution in the red spectrum is higher compared to prism-type spectroscopes.

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.