Products

S
Natural diamond under 405 nm laser excitations, DFI system

To answer the trade main needs, GGTL Laboratories has been developing instruments to improve the gemstones analysis. We focus on matters such as authentication, synthetic discrimination, treatment disclosure and origin determination.

GGTL DFI System

Discover

Developed in house, the DFI is an extraordinary instrument dedicated to the identification of synthetic diamonds in parcels of colourless (D-Z) diamonds; with the necessary expertise, the DFI can used for a large range of other analyses, for coloured diamonds and coloured stones. The operating principles are the direct simultaneous observation of the luminescence under various UV and laser excitations (several excitation bands from the deep UV all the way to 405 nm), the room or low temperature luminescence spectra and finally the Raman spectra. Currently, the DFI is the only instrument (along with the D-Tect) able to unambiguously identify a stone as being natural diamond, synthetic diamond or a diamond imitation, without any further testing (no “refers”) ever needed. The instrument’s ingenious Spect-Ident software developed by GGTL gives an unexperienced user the possibility to conclude without need of spectral interpretation and permits a significant increase in screening speed. The DFI can be supplied with a single channel or a double channel spectrometer calibrated for absolute irradiance, which both have very high throughput and cooled CCD detectors and hence permit very rapid analysis; the single channel system has a spectral resolution of 1.3 nm while the double channel system has a resolution of about 0.3 to 0.7 nm.

Need more information?

Contact us

D-Tect

Discover

The D-Tect – the little brother of the DFI – was designed and produced by GGTL Laboratories for HRD Antwerp. It works similarly to the DFI but has a more limited range of excitations available. It is dedicated to the identification of colourless “D-Z” diamonds, especially the ones rejected by automatic machines such as the M-ScreenTM, which is probably the most reliable automated instrument for the identification of suspicious stones in melee parcels. The D-Tect instrument is exclusively distributed by HRD. The D-Tect - similar to the DFI - allows the direct and unambiguous identification of natural diamonds, synthetic diamonds and diamond imitations.  It is highly unusual to encounter stones for which one cannot conclude. The D-Tect comes with the same GGTL Spect-Ident analytical software used with the DFI that automates the spectral interpretation and significantly speeds and secures up the analysis. The D-Tect is equipped with a single channel spectrometer, calibrated for absolute irradiance, with cooled CCD offering a resolution of 1.3 nm.

Need more information?

Contact us

GGTL UV-Vis-NIR

Discover

Our UV-Vis-NIR spectrometer has been specifically designed to analyse gemstones of all sizes, from 1.1 mm to large sizes, at room and at low temperature (-196°C, liquid nitrogen conditions). The analysis time with this instrument is very fast; single scans takes less than 50 msec, making multi-scan acquisitions very efficient. The instrument can be supplied in various configurations that permit resolutions between 0.3 and 1.2 nm. The instrument is delivered with all accessories needed for low temperature spectroscopy, and upon request, we can supply the accessory for the acquisition of polarized spectra.

Need more information?

Contact us

GGTL Photoluminator

Discover

The GGTL Photoluminator Raman/Photoluminescence spectrometer system is specifically built for the analysis of gemstones. Its main application is for low temperature photoluminescence spectroscopy of diamond. The system is adjustable with various lasers from 360 to 785 nm and various spectrometers, allowing solutions for various budgets and applications. The standard Photoluminator system uses three lasers: a 405 nm, a 473 nm, and a 532 nm laser, which can be exchanged in less than one minute without the need of changing the position of the sample that is being analysed.

The sample chamber is sealed against any laser leakage and the lasers can only be operated with a closed sample chamber door; hence the instrument is classified as a class I laser product. Inside the sample chamber a volume of 28x29x32 cm is available and the samples are moved on a motorized XYZ stage with 50 mm motion in each direction. The stage is set up to work best with the special GGTL low temperature accessory supplied with the system. 
The GGTL Photoluminator system can be coupled with a series of different spectrometers via a fibre optic cable. The standard version uses a quadruple-channel spectrometer with thermoelectrically cooled CCD detector that operates over a range of 250 to 1050 nm offering a rather high resolution of 0.30 nm. If even higher throughput is needed, then double or even single channel spectrometers with equally cooled CCD detectors can be supplied; these have a lower resolution of 0.60 nm (double channel) and 1.2 nm (single channel) but have a higher light throughput. If a higher resolution is needed, we can supply a research grade Echelle spectrograph with the GGTL Photoluminator that delivers a (average) phenomenal resolution of 0.05 nm over the range of 350 to 1150 nm. It uses an Andor camera with a thermoelectrically cooled CMOS detector. The acquisition time using such a system is distinctly longer than with the above spectrometers, and this type of spectrograph is also more complicated to use.

Need more information?

Contact us