Gemstones
General Information For Lab Testing
- NGI, led by Zeng C G, the founder, a highly experienced and qualified gemologist in Singapore
- Applies his extensive knowledge in geology, mineralogy, gemology and effective use of gemological instruments, specialises in conducting professional testing on a wide variety of gemstones and minerals
- Delivers a high standard of assurance regarding gemstone identification, enhancement / treatments detection and geographic origin determination
- Results are given based on our current knowledge and represent the expert opinion at the time of testing
Mr Zeng firmly believes gem testing experience together with the state-of-art testing instruments are paramount to ensure a high standard conclusion. The identification of gem & its treatments often depends upon the analysis performed with spectrometers. Besides standard gemological instruments, the analytical instruments present in our laboratory comprises:
- UV-Vis spectrometers
- FTIR, Fourier Transform Infrared Spectrometers
- EXDRF, Energy Dispersive X-ray Fluorescence Spectrometer
- Raman micro spectrometry
- Photoluminescence (PL)
Equipped with full gem lab facilities, NGI not only tests a wide range of colored gemstones such as alexandrite, emeralds, rubies, sapphires, spinels, paraiba, corals, opals and many more colored gemstones, but also test rare gems such as taaffeite, red beryl, poudretteite just to name a few.
Our core tests include:
- Identify natural gemstone from its synthetic counterparts
- Detect enhancement / treatments of the gemstone, eg, heated, and heated with elements to enhance the color and improve clarity eg. beryllium treated padparadscha, lead glass-filled ruby
- Determine the color as natural or with enhancement in the presence of traces of element
- Grade the clarity of the gems, especially emerald on the level of enhancement
- Determine the geographic origin of gemstones, in addition to microscope observation on inclusions, chemical analytical tests from EXDRF or Raman spectrometry with photoluminescence PL are used to confirm the conclusion when applicable
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