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

Electronic Gem Spectroscope, FTS-CCD

Electronic Gem Spectroscope
Electronic Gem Spectroscope Electronic Gem Spectroscope Electronic Gem Spectroscope Electronic Gem Spectroscope
Main Features & Specifications
  • Tabletop dual-light source base with button-controlled switching, enabling both transmission and reflection observation modes.
  • Transmission light source: LED with encoder-controlled dimming, offering fast and slow dimming modes for continuous brightness adjustment.
  • Reflection light source: LED with encoder-controlled dimming, also featuring fast and slow dimming modes for precise brightness control.
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Optical & Spectral Specifications
  • Spectral range: 400-700nm continuous spectrum for both transmission and reflection modes.
  • Sample chamber: Flip-cover darkroom design that prevents external light interference. Features an adjustable light entry aperture ranging from Φ2mm to Φ28mm, which allows a flexible sample positioning.
  • User interface:
    1. Integrated system with a built-in mini-computer and 7-inch touchscreen display (approx. 105mm × 85mm).
    2. Allows switching between full spectrum, blue-violet region, and red-yellow region, depending on gemstone absorption characteristics.
  • Spectral scale range: 400-700nm, with calibration functionality.
  • Spectroscope type: Diffraction grating spectroscope.
  • Brightness adjustment: Rotary knob for fine-tuning light intensity, ensuring clear visibility of absorption lines.
  • Detector: 1280 × 1024 high-performance sensor with a dynamic range of 68.2dB.
  • Sensitivity: 2.1V/lux-sec.
  • Resolution: 0.4nm.
Electronic Gem Spectroscope
Environmental & Power Specifications
  • Operating temperature: -10°C to 60°C.
  • Operating voltage: DC 12V.
Connectivity & Storage Features
  • Projection function: Includes a VGA output, enabling lossless projection of absorption spectra onto a projector or teaching screen.
  • Storage function:
    1. Fitted with one-click screenshot save button on the main interface for easy storage of absorption spectra images for educational use.
    2. Equipped with two USB ports, supporting external storage devices like USB drives and portable hard drives.
Size & Portability
  • Compact and portable design, measuring no more than 21cm × 16cm × 19cm and weighing less than 2.5kg.

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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