GL GemSpec NIR PL405



We are proud to offer a special member in our line of Advanced Gem Testing Instruments. 

The GL Gem SpectrometerTM NIR PL405 is a dual purpose research spectrometer for photo luminescence (PL) studies; with the included GL Halogen Gem Holder it can be used for VIS-NIR spectroscopy (550 – 1,000 nm) as well but will not display the Cape lines of diamonds which are important for diamond characterization. The spectrometer 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 in real-time.

The spectrometer has a higher resolution (but a smaller wavelength range 550 – 1,000 nm) than the original GL Gem Spectrometer (300 – 1,000 nm) , a built-in Long Wave Pass Filter (LWPF) and is optimized for the NIR range.

GL Gem Spectrometer NIR PL405

GL Gem Spectrometer NIR PL405

It allows identification of many gemstones such as ruby, sapphire, emerald, spinel, alexandrite, etc. based on their PL response alone and is an efficient  tool for quick diamond testing; it will detect the GR1 center for irradiated diamonds and the Si center often seen in CVD grown diamonds – in some cases without LN cooling.

It can be used in addition to the GL Gem Spectrometer or on its own as a dedicated PL and transmission spectrometer as many gem materials have important features in the VIS-NIR range. For instance it will identify untreated jadeite (it will not show the PL band for polymer treated jade due to the built-in LWP filter). Diamond irradiation, copper content in “Paraiba” tourmaline will be visible in the spectrum. First studies indicate that heat treatments such as in red spinel can be determined.

In PL mode it is almost as sensitive as the GL Gem Raman PL532 and can serve as a low-cost PL spectrometer.

NOTE: For general spectroscopy and PL studies we recommend our top seller GL Gem Spectrometer system in combination with the GL Analyzer PL405/GL Xenon Flashlight Combo Kit.

Click here to order the GL Gem Spectrometer NIR PL405.

Click here to download P.romotional Flyer (PDF).

Information Material

Lead Filled Ruby PL Spectrum

Lead Filled Ruby PL Spectrum (blue laser)

Absorption vs PL Spectrum

Absorption vs PL Spectrum (halogen vs blue laser)

Chatham Diamond

Chatham grown Diamond PL Spectrum

Photoluminescence studies with low-cost spectrometers is a relatively new application; the supplied spectra show initial results of our work and are based on disclosure by the owner of the sample..

Gemlab R&T Development and Support Team

  • J Wolf Kuehn, B.A., M.A., PDP (SFU), Dipl.oec, F.G.G. – GLR&T Project Manager, Vancouver, B.C., Canada
  • Stanislav O Konorov, Ph.D. (Laser Physics), Senior Scientific Assistant, Dept. of Chemistry, University of Victoria, B.C., Canada
  • Matthew Stockinger, B.A. (Chemistry, Mathematics), M.S. (Teaching), St. Cloud, MN, USA
  • Jean-Marie Dereppe, Ph.D. (Professor Emeritus, Physical Chemistry Department), University of Louvain, Belgium

Specifications of the GL Gem Spectrometer NIR PL405

GL Gem Spectrometer NIR PL405

GL Gem Spectrometer NIR PL405

  • Weight: 510 grams  Dimensions: 170 mm x 100 mm x 50 mm
  • Detector: Toshiba TCD1304DG linear array
  • Detector range: 550 – 1000 nm   Pixels: 3648 Pixel size: 8 um x 200 um
  • Signal-to-noise ratio: 500:1 A/D resolution:16 bit; onboard averaging; better S/N above 200 ms
  • Fiber optic connector: SMA 905 to 0.22 numerical aperture single-strand optical fiber
  • Wavelength and Optical resolution: 550-1000 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 7/8/10 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 350 users world-wide; starting with the 2013 model we use a new sensor which will improve signal sensitivity.

The GL Gem Spectrometer NIR PL405 is an exclusive design by Gemlab Research & Technology (a subsidiary of Canadian Institute of Gemmology) and its software is protected by copyright laws; we are exclusive distributors worldwide.

Portable GL Gem Spectrometer NIR PL405  System with GL Halogen 10W Gem Holder (included)

Package includes:

  • GL Gem Spectrometer NIR PL405
  • GL Halogen 10W Holder (new design)
  • >10 mW commerical blue laser (405 nm), Class 2, tripod stand to position laser
  • 2x 1850 or 2x 16340 Lithium battery with charger or power supply (120 – 240 V)
  • Laser Safety Goggles for 190 nm – 550 nm, OD+6, VLPR >65%, CE certified
  • USB Cable to connect to USB port of computer
  • 12/15 Volt power supply for light holder (110 – 240 V, international adapter plugs)
  • CD/USB stick with software and “How to Get Started” instructions
  • “Pragmatic Spectroscopy for Gemologists (2nd edition)” by Hanneman/Kuehn
  • access to data-base with over 350 reference spectra and 100 on-line image gallery
NIR PL405 Kit

Accessories for GL Spectrometer NIR PL405

PRICE  US$ 1,795.00; this unit must be pre-ordered (lead time 3 – 4 weeks).

Gemlab Research & Technology is manufacturer and exclusive distributor worldwide; we do not use re-sellers. 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 your own protection always use laser safety goggles when operating any type of laser equipment.

Setup for external illumination of sample with GL Xenon Flashlight

Setup for external illumination of sample with the GL Xenon Flashlight


Shine the GL Xenon Flashlight from above onto the sample and observe the spectral graph

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.

Click here to order the GL Gem Spectrometer NIR PL405.

Specifications of the GL Halogen Gem Holder

GL Halogen 5/10W Gem Holder with built-in cosine corrector, 20 x 20 mm opening and 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.

  • Weight: 80 gr
  • Dimensions: 75 x 50 x 27 mm
  • Size of opening: 20 x 20 mm
  • 12 – 15 V/1.5 A power adapter (110-240 V, international adapter plugs)

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.

GL Gem Halogen Holder

GL Gem Halogen Holder

The GL Halogen 5/10W Gem Holder is an exclusive design of Gemlab Research & Technology and is protected by copyright laws.

System Requirements

Portable GL Gem Spectrometer with Netbook

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 7/8/10 for 32/64 bit); 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 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 Vancouver, Canada. 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 firmware/CCD upgrades for a processing fee of US$ 495 which covers the update, new software, re-alignment and re-calibration, etc. and return shipping charges; other repair services upon request. Software updates are always free.

Photoluminescence Spectra (non-polarized)

This page is still under development. Photoluminescence studies with low-cost spectrometers is a relatively new application; the supplied spectra show initial results of our work and are based on disclosures by the owner of the samples.

Spinel PL 405

Spinel comparison (blue laser)


Ruby comparison (blue laser)


Grossular Garnet, yellow (blue laser)

Spinel, red PL405

Spinel, natural vs synthetic (blue laser)

Absorption vs PL Spectrum

Absorption vs PL Spectrum (halogen vs blue laser)

Absorption vs PL Spectrum

Absorption vs PL Spectrum (halogen vs blue laser)

Tourmaline, CU bearing

The Cu2+ peak can be seen in the NIR PL405 spectrometer (halogen).

Jadeite Burma Untreated

The 690 nm peak can be seen in the NIR PL405 spectrometer (halogen).

Diamond Characterization (spectra obtained with the GL Gem Spectrometer NIR PL405)

PL (405 nm blue laser excitation) at room temperature
Dia Green

Synth. Green Diamond (blue laser, room temperature)

Pink Diamond

Pink Diamond, multi-step HPHT treated, irradiated (blue laser, room temperature)

Apollo Diamond

Synth. Purple Diamond, multi-step HPHT treated, irradiated (blue laser, room temperature)

Absorption (GL Gem Halogen Light)
Synthetic Yellow Diamond

Synthetic Yellow Diamond (halogen)

Synthetic Green Diamond

Synth. Greeen Diamond  (GR1 radiation peak at 741 nm)

 Corundum PL Characterization (blue laser excitation)

Ruby Thai

Ruby, Thailand (blue laser)

Sapphire Madagascar

Blue Sapphire, Madagascar (blue laser)

Sapphire Yellow Synth

Synth. Yellow Sapphire (blue laser)

Above PL spectra edited in Spekwin32.

Jadeite PL Characterization (blue laser excitation)

Untreated Green Jadeite

Untreated Green Jadeite (blue laser)

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.

Spectrograph provided by John Harris, Gemlab.UK

GL Halogen Holder and External Xenon Light Source

New version of Spekwin32 will display absorption spectrum  as seen through a hand spectroscope.

New version of Spekwin32 will display absorption spectrum as seen through a hand spectroscope.


Wolf Kuehn, B.A., M.A., PDP (S.F.U.), Dipl.oec, F.G.G. – GLR&T Project Manager

© 2015 Gemlab Research & Technology, Vancouver, Canada –