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 Spectrometer™is an innovative and advanced gem testing instrument for experienced gemmologists, gem merchants, mineral collectors and others; it is also an excellent educational tool.
It helps to identify gemstones based on their spectral pattern and to analyze chromophores causing certain colours. It is capable to detect irradiated diamonds and possible HPHT treatments and whether green jadeite is naturally coloured. It replaces the traditional hand-held spectroscope avoiding potential eye damage under strong halogen light.
The unique gem light holder 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 in 32 countries around the world including: Australia, Austria, Belgium, Bolivia, Brazil, Canada, Czech Republic, Cyprus, Germany, France, Greece, Hong Kong, Hungary, Indonesia, Malaysia, Monaco, New Zealand, Philippines, Oman, Poland, Russia, Singapore, Slovakia, South Africa, Spain, Sri Lanka, Switzerland, Sweden, Thailand, UK, USA and Vietnam.
I utilize my GLGemSpec to assist me in identifying and verifying gemstones from suppliers. The accuracy is better than the human eye in observing the spectral data. When there is something that does not appear as expected during testing I scrutinize the data more closely. Having the advantage of covering a large spectrum the GLGemSpec allows me to process more data about the products prior to sale or resale and assists in keeping records of those items. – R. Kreinbrink, Owner, SOC Jewelry
Click here to download Promotional Flyer (PDF)
- How to Obtain a Spectrum with the GLGemSpec – (video, no sound – window will pop up) Ruby, synthetic, flame fusion, colour: strong vR
- How to Edit a GLGemSpec Spectrum in Spekwin32 – (video, no sound – window will pop up) Green Sapphire from Pailin (unheated)
- Method to test if jadeite is naturally coloured – (video, no sound – window will pop up) Untreated jadeite reference, dyed jadeite and nephrite
- See on-line sample spectra
- GL Gem Spectrometer and Advanced Gem Testing (PDF) – PowerPoint Presentation from the “ISG Lab Updates” session in Tucson, AZ (February 4, 2011)
- An article about the GL Gem Spectrometer appeared in the French Revue de gemmologie AFG N 183 (2013) (PDF 1.7 MB)
- Le Spectrometre UV-VIS-NIR GLGemSpec (PDF) – A presentation by Claude Lamarre, G.J., F.G.A., M.V. (in French)
The GL Gem Spectrometer™ is very efficient in detecting whether green jadeite has been treated or not or whether the stone is one of the newer glass filled sapphires.
With a blue laser (405 nm) excitation source (GL Analyzer PL405 Kit recommended) a strong luminescence band appears in the green wavelength range of polymer treated jadeite which is absent in untreated green jadeite. More info in the GLGemSpec Support section.
For your own protection always use laser safety goggles when operating any type of laser equipment.
Download jadeite info sheet (PDF, 540KB).
Gemlab R&T Development and Support Team
- J Wolf Kuehn, B.A., M.A., Dipl.oec, PDP (SFU), F.G.A., F.G.G. – GLR&T Project Manager, Vancouver, B.C., Canada
- Stanislav O Konorov, Ph.D. (Laser Physics), Research Scientist, Michael Smith Laboratories (UBC), Vancouver, B.C., Canada
- Matthew Stockinger, B.A. (Chemistry, Mathematics), M.S. (Teaching), St. Cloud, MN, USA
- W. William Hanneman, Ph.D. (Chemistry, retired), Rio Rancho, New Mexico, USA
Specifications of the GL Gem Spectrometer™
- Weight: 510 grams
- Dimensions: 170 mm x 100 mm x 50 mm
- Detector: Toshiba TCD1304DG linear array
- Detector range: 200 – 1100 nm
- Pixels: 3648 Pixel size: 8 um x 200 um
- 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 nm
- 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 and 8 32/64 bit and others; with proprietary firmware for GL Halogen 10W Gem Holder
We have fine-tuned the hardware and software of the GL Gem Spectrometer which has over 150 users world-wide; starting with the 2013 model we use a new sensor which will improve signal sensitivity.
Portable GL Gem Spectrometer™ System with GL Halogen 10W Gem Holder (included)
NEW LOW PRICE : US$ 1,495.00
Please request pro forma invoice for shipping options outside North America. All wire transfers must follow FINTRAC Guidelines (will be provided in the pro forma invoice) or they will be rejected.
For work with larger samples and gems set in jewellery we recommend the GL Xenon Flashlight setup (see image) and/or the GL Fiber Probe with diffuser 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.
Specifications of the GL Halogen Gem Holder
GL Halogen 5/10 W 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.
This unit is included in the basic GL Gem Spectrometer™ package.
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.
The GL Halogen 5/10W Gem Holder is an exclusive design of Gemlab Research & Technology and is protected by copyright laws.
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 and 8 for 32/64 bit and LINUX/Mac OSX tested with wine 0.9.20 and MacOS inside VirtualBox); for developers the VIs and a runtime package for LabVIEW 2009 are included. A single user license is provided for each GL Gem Spectrometer system.
The 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 and up 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.
Users of the GLGemSpec system have access to the Gemlab R & T spectra database which is available on-line
Our Warranty and Commitment
The GL Gem Spectrometer™ is an advanced gem testing instrument for users who have a good understanding of spectroscopy and should be familiar with the use of a traditional gemmological spectroscope and the interpretation of spectra. The instrument is not capable of identifying or naming a sample; it should be used with other gem testing tools before arriving at a conclusion.
If you are not satisfied with the performance of the spectrometer we will accept returns within 10 days but have to charge a restocking fee of 10% to cover our expenses of shipping/handling and recalibration if necessary. The purchaser is also responsible for the shipping and insurance to return the item. 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, etc. and return shipping charges; other repair services upon request. Software updates are always free.
Transmission Spectra (non-polarized) obtained with the GLGemSpec
|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
|Synth. flame fusion ruby||Unheated blGR Pailin sapphire||Pink cubic zirconia|
Corrected transmission 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.
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 improved readability in the 400 nm and below as well as above 900 nm by using a higher voltage (15V) to drive 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.
Colour-producing diamond defects not related to diamond type can be seen with the spectrometer (see peaks at 480, 550, 575, 595, 741 nm) – edited in Spekwin32
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).
Second-order effects from diffraction at 750 and 800 nm; a multi-bandpass detector coating recommended for UV light sources.
Download the archived GLGemSpec files “RubySynFlame.fak and Reference.fak” (.rar file), and import for smoothing, normalization, base-line correction, zoom, editing into Spekwin32 ( Download Spekwin32 revised version 188.8.131.52 from Nov 05 2012, file size: 1.3 MB by F. Menges).
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 Institute 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 book “Pragmatic Spectroscopy for Gemologists” with many reference spectra obtained from his own collection of gems; a copy of the 2nd edition is included with the purchase of each GLGemSpec system.
|The GL Gem SpectrometerTM can be used in LabVIEW environment; VIs provided for developers.|
Wolf Kuehn, B.A., M.A., Dipl.oec, F.G.A., F.G.G. – GLR&T Project Manager
© 2010 Gemlab Research & Technology, Vancouver, Canada – www.gemlab.ws