GL Gem Spectrometer
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We are proud to offer this economically priced and efficient portable spectrometer (UV-VIS-NIR, 300 – 1,000 nm) which can be operated from the USB port of a laptop computer. No additional drivers are necessary; the easy to learn GLGemSpec software displays both absorbance and transmittance spectra. The GL Gem SpectrometerTM is an innovative and advanced gem testing instrument for gemmologists, jewellers, gem dealers and others; it is also an excellent educational tool. The unique gem holder with halogen light source (VIS-NIR, 400 – 950 nm) is mounted directly onto the spectrometer allowing fast real-time spectral analysis and bulk testing of both rough and faceted gemstones. There are GLGemSpec users around the world including: Australia, Brazil, Canada, Czech Republic, Germany, France, Greece, Hong Kong, Indonesia, Malaysia, New Zealand, Philippines, South Africa, Sri Lanka, Switzerland, Sweden, UK and USA.
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Specifications of the GL Gem Spectrometer™
- Weight: 510 grams
- Dimensions: 170 mm x 100 mm x 50 mm
- Detector: Toshiba TCD1304AP linear array (enhanced by a proprietary process)
- Detector range: 200 – 1100 nm
- Pixels: 3648 Pixel size: 8 mm x200 mm
- Signal-to-noise ratio: 300:1 A/D resolution:14 bit
- Fiber optic connector: SMA 905 to 0.22 numerical aperture single-strand optical fiber
- Wavelength and Optical resolution: 300-1000 nm < 1.0 nm with 25 µm slit
- Exposure time: 2.5 ms-10 s CCD reading time: 14 ms Data transfer speed: 200 ms / 100 ms (2 points binding)
- Power consumption: 200mA @ 5V from computer interface: USB 2.0, HID 2.0 (USB cable included)
- Operational system: Windows XP/Vista/Windows 7 32/64 bit and others; with proprietary firmware for GL Halogen 10W Gem Holder
Information Material
- Download GL Gem Spectrometer and Advanced Gem Testing (PDF) – PowerPoint presentation from the “ISG Lab Updates and Reports” session in Tucson, AZ (February 4, 2011)
- Download Getting Started Guide (PDF)
- Download Promotional Flyer (PDF)
- How to Obtain a Spectrum – (video, no sound – a separate window will pop up) Ruby, synthetic, flame fusion, colour: strong vR
- How to Edit a GLGemSpec Spectrum in Spekwin32 – (video, no sound – a separate window will pop up) Green Sapphire from Pailin (unheated)
- Method to test if jadeite is naturally coloured – (video, no sound – a separate window will pop up) Untreated jadeite reference, dyed jadeite and nephrite
- See on-line sample spectra
- Le Spectrometre UV-VIS-NIR GLGemSpec (PDF) – A presentation by Claude Lamarre, G.J., F.G.A., M.V. (in French)
Portable GL Gem Spectrometer System with GL Halogen 10W Gem Holder (included)
Package includes:
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PACKAGE PRICE : Can$ 1,595.00 (be aware of additional fees charged to foreign credit cards)
* Approximate prices in USS$ 1,575.00, Euros 1.230,00 are for direct bank transfer (currency exchange as of January 1, 2012). Please request pro forma invoice for shipping options outside North America; allow 3 – 4 weeks for delivery.
Note: For work with gemstones set in jewellery and larger samples we recommend the GL Fiber Probe with diffuser and/or the GL Fiber Holder which can be purchased separately. Using a fiber probe with the GL Gem Spectrometer requires a customized setup with external lighting and will change several parameters for obtaining a spectrum. Results may vary dependent on light source and its position, sample size (affecting path length) and orientation, etc.; spectra will look different from those found in the database and/or obtained with the GL 10W Halogen Gem Holder.
Free Delivery to Canada and Continental USA
Click Here to Order the GL Gem Spectrometer
Specifications of the GL Halogen Gem Holder
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GL Halogen 10W Gem Holder with built-in cosine corrector, 20 x 20 mm opening, SMA 905 coupler, cooling fan. Similar to an integration sphere the built-in halogen light source is internally diffused by the holder’s black matte finish The GLGemSpec software optimizes the spectrometer in for gemmologists important VIS-NIR 400 – 950 nm range. This unit is included in the basic GL Gem SpectrometerTM package.
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This light holder has been optimized for the VIS-NIR 400 – 950 nm range; with the additional diffuser adapter other light sources such as UV LED, Xenon flashlights, etc. can be used. It has a SMA 905 coupler and can be mounted onto spectrometers of other manufacturers; please contact us to confirm compatibility.
Price: Can$ 295.00 (SPECIAL ORDER)
System Requirements
Portable GL Gem Spectrometer
The GL Gem Spectrometer™ requires a computer with a USB port (no separate drivers necessary, USB 2.0/HID 1.0 compliant). The software package contains the GLGemSpec program (Windows XP/Vista/Win 7 for 32/64 bit and LINUX/Mac OSX tested with wine 0.9.20 and MacOS inside VirtualBox); also provided is a runtime package for LabVIEW 7.1 (for developers the VIs for LabVIEW version 7.1 and 2009 are provided). A single user license is provided for each GL Gem Spectrometer system.
The recently updated GLGemSpec program has a spectral colour bar for reference and a zoom feature with a fixed 400 – 700 nm range and user defined range. Version 2.5 has a normalization feature built-in to allow for better comparison of user spectra; the software works only with the modified firmware of the GL Gem Spectrometer
The GL Halogen 10W Gem Holder is an exclusive design of Gemlab Research & Technology and is protected by copyright laws. Users of the GLGemSpec system have access to the Gemlab R & T spectra database which is available on-line.
Our Warranty and Commitment
We will repair and replace your GL Gem Spectrometer if necessary due to defective parts, etc during the first 6 months unless other consumer protection regulations exist in your country. We also offer free firmware/CCD upgrades within 12 months if shipped to us at your cost and risk and we will return the unit to you at no cost. After 12 months a processing fee of $ 295 will be charged which covers the firmware update with any CCD upgrade (can be customized), re-alignment and recalibration for dropped spectrometers, etc. and return shipping charges; other repair services upon request. Software updates are always free.
Transmission Spectra (non-polarized) obtained with the GLGemSpec
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| Synth. flame fusion ruby | Unheated blGR Pailin sapphire | Pink cubic zirconia |
Note: Transmission dips correspond to dark lines or bands seen in a hand-held spectroscope
Converted and Normalized Absorption Spectra
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| Synth. flame fusion ruby | Unheated blGR Pailin sapphire | Pink cubic zirconia |
Download the archived GLGemSpec files “RubySynFlame.fak and Reference.fak” (.rar file), and import for smoothing, normalization, base-line correction, zoom, editing into Spekwin32 - free optical spectroscopy software revised Version 1.71.6 by F. Menges.
Corrected transmittance spectrum of synth. flame fusion ruby
The non-polarized spectrum of flame fusion ruby in the graph below shows corresponding absorption lines and bands as would be seen in a diffraction grating hand-spectroscope.
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Corrected transmittance spectrum (non-polarized) of synth. flame fusion ruby as seen in the GLGemSpec interface: For example if transmission for certain wavelengths (in nm) is LOW absorbance for those wavelengths will be HIGH (in a conventional spectroscope one would see dark lines or bands at these positions; indicated as bars and lines). Noise visible below 410 nm is due to limitations of the halogen light bulb. We could improve readability in the 400 nm and below as well as above 900 nm by using a higher voltage for the halogen bulb. For experiments LW and SW UV LEDs can be used to illuminate samples in the light holder. A multi-bandpass detector coating might be required to eliminate second-order effects. See below.
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Click on the image above to see more detail. |
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| Typical absorption in the 920 – 940 nm range of copper bearing tourmaline (edited in Spekwin32) | Jadeite, Burma – naturally coloured with typical absorption lines at 437 nm, 630 nm, 655 nm and 690 nm (edited in Spekwin32) |
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| Typical 415.5 and 478 nm peaks for Cape type Ia diamond | Irradiated diamonds with typical GR-1 band at 743 nm |
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Emission spectrum of UV LED 365 nm (Nichia, black), LED 395 nm (blue), IR LED 835 nm (red) – Synth.flame fusion ruby, scope mode with emission peaks, excitation source UV LED 395 nm (edited in Spekwin32). Note the second-order effects from diffraction at 750 and 800 nm; a multi-bandpass detector coating is recommended for UV light sources. Please contact us. |
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| The GL Gem SpectrometerTM can be used in LabVIEW environment; VIs provided for developers. |
 Spectrograph provided by John Harris, Gemlab.UK |
 Spectral Output of GL Halogen Holder and External Xenon Light Source |
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Uncorrected transmission spectrum in SpectraSuite (scope mode) of synth. flame fusion ruby |
| The GL Halogen 10W Gem Holder mounted onto our Ocean Optics USB4000 (350 – 1,000 nm) |
About This Project
The GL Gem Spectrometer™ system has been under development for several years. My interest in spectroscopy goes back to Bill Hannemann’s book “Video-Spectroscopy: 21st Century Gemology” published in 1988. With 2 years of university physics in my academic background I was intrigued by Bill’s concept and saw its potential but Video Spectroscopy never took off the ground.
Almost 20 years later I started using an Ocean Optics USB 2000 (200 – 850 nm) spectrometer for research in the UV range and a NIR 256-2.5 spectrometer for IR studies – but I must admit that the GL Gem Spectrometer has replaced both; it is being used every day in the Gemlab Research & Technology lab and during courses I teach at the Canadian Institue of Gemmology (C.I.G.).
The maker of the spectrometer is a post-doctoral research scientist working at a local university lab facility; he is internationally acclaimed for his work and long list of publications about transmission and Raman spectroscopy (in particular its application in stem cell research).
I would like to thank Dr. Bill Hanneman for including the GL Gem Spectrometer in his new book “Pragmatic Spectroscopy for Gemologists” with many reference spectra obtained from his own collection of gems; a copy is included with the purchase of each GLGemSpec system.
Wolf Kuehn, B.A., M.A., Dipl.oec, F.G.A., F.G.G. – GLR&T Project Manager
© 2011 Gemlab Research & Technology, Vancouver, Canada – www.gemlab.ws
The name and logo 
is a registered trade mark (Registration # TMA407372 Canadian Intellectual Property Office)