Gemological Instruments
Gemstone identification tools for identifying stones by analyzing their absorption spectra

Tabletop Gem Spectroscope, FTS-50

Tabletop Gem Spectroscope
Tabletop Gem Spectroscope Tabletop Gem Spectroscope Tabletop Gem Spectroscope Tabletop Gem Spectroscope
Length 234mm
Width 168mm
Height 110mm
Net weight 3.78kg
Built-in digital scale 400-700nm
Packaging Foam-padded export-grade cardboard box
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Features
  • Comes with a dedicated base that includes a gemstone holder and integrated light source for stable operation.
  • Features a dual-light source system, allowing both reflection and transmission observation for more detailed gemstone analysis.
  • Equipped with a built-in scale, along with adjustable focus, scale positioning, and light intake control to enhance measurement precision.
  • High-resolution dual-tube design with an engraved scale for easy reading. The white-coated base gives a refined and professional appearance
  • Triple-prism imaging system
  • Non-uniform wavelength spectrum, enhancing the visibility of darker blue-violet regions.
    1. The spectral bands are unevenly spaced, with the blue-violet region appearing wider and the red region compressed.
    2. Higher transmission for a brighter spectral display.
    3. 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.
Tabletop Spectroscope Base
Tabletop Spectroscope Base
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Specifications
  • Designed for spectroscopic testing, featuring a continuous-spectrum high-intensity white light source.
  • Dual adjustable lamp system:
    1. 12V/50W high-intensity halogen cold light lamp, offering strong transmission and reflection illumination.
    2. Efficient cold light output, reducing heat exposure to the optical fiber tube.
  • Fully modular electrical system, making maintenance more convenient.
  • 600mm high-temperature-resistant self-locking optical fiber tube, ensuring precision and durability.
  • Integrated cooling fan, enabling extended operation without overheating.
  • Adjustable light aperture: Φ2mm to Φ28mm, supporting various sample sizes.
  • Versatile functionality: Can function as both a spectroscope light source and a fiber optic light source.
  • Dual sample grooves, for easy gemstone placement.
  • Dedicated lens mount, ensuring precise and effortless adjustments.
  • Quick and secure lamp replacement system, making maintenance fast and safe.
  • Ergonomic design, with gemstone holder installation slots on both sides.
  • Magnetic universal gemstone holder base, providing stability and flexibility.
  • Input voltage: 220V wide-range voltage compatibility.

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.
Usage Methods
Transmission light method Transmission light method
Internal reflection method Internal reflection method
Surface reflection method Surface reflection method
Absorption Spectrum
Absorption spectrum of almandine garnet Absorption spectrum of almandine garnet
Absorption spectrum of emerald Absorption spectrum of emerald
Absorption spectrum of ruby Absorption spectrum of ruby
Absorption spectrum of peridot Absorption spectrum of peridot
Spectral Diagram
Spectral Diagram of a Gem Spectroscope

A prism spectroscope produces a non-uniform wavelength spectrum

Spectral Diagram of a Gem Spectroscope

A diffraction grating spectroscope generates a uniform wavelength distribution.

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