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| LA-ICP-MS Spectrometry |
| Laser tomograph |
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| Laser tomography system (GAAJ original) to observe crystal structure. |
GAAJ leads the world in introducing this instrument into the field of gemstone examination in 1984, and has been carrying on research with the original analytical device. Very fine structure and defects inside a gemstone can be detected as a scattering image or fluorescent image by scanning a narrowed laser beam (488nm argon laser).
This analytical technique is highly recognised even internationally as a very effective unique technique to reveal a formation origin or heating history of ruby or sapphire and origin of quartz.
We issue a highly analytical report gGemstone Analysis Reporth to prove the locality and presence or absence of heat treatment in corundum by using this technique.
>>> Laboratory Technique gLaser Tomographh |
| Laser Induced Breakdown Spectrometry |
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LIBS2000+system (Ocean Optic)
CFR200 (Big Sky Laser) |
When an infrared laser is converged on the surface of a solid sample, a temperature of the surface rapidly heats up and vaporize, ablated aersols (gaseous particles) becomes electronic excited state. As the laser pulse decays, excited electrons emit light of characteristic wavelength distinct to the element while they drop down to the lower energy level. Although its detection limit is not as low as LA-ICP-MS,
it has a high sensitivity of 1ppm level for Be. With its excellentoperability,
it can be effectively used for detection of Be-diffused
heat treatment in corundum.
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| Laser Induced Breakdown Spectrometry (LIBS) |
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| Cathode Luminescence equipment |
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| Luminoscope elm-3 (Premier American Technologies Corp.) |
This is the device to observe luminous phenomenon of a gemstone when exposed to an electron beam, that is, cathode luminescence. Diamonds show uniform luminescence under ultraviolet light, but cathode luminescence of each diamond shows unique pattern according to the difference of luminescence intensity in detail, and this is the most effective means for individual recognition and identification of synthetic stones. Natural diamonds especially show distinct luminescence figures (CL figures) in reflecting their growth histories, which never be identical to others. Similar to fingerprint of a man, by this property the diamond fingerprint can be a resume of a diamond.
GAAJ Gemmological Laboratory issues a gDiamond Fingerprinth proving a growth history of an individual diamond. |
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| Luminoscope elm-3 |
CL Image (type I a natural diamond) |
DIAMOND FINGERPRINT® |
| Raman Microprobe Spectroscope |
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Laser Raman micro spectrometry system-inVia (Renishaw) 633nm and 325nm(UV) excitation laser, with liquid nitrogen cooling system.
Laser Raman micro spectrometry system-model 1000 (Renishaw) 514nm and 488nm excitation laser, with liquid nitrogen cooling system. |
Raman scattering is used to identify a substance or to analyse molecular structure. It is expected in the study of gemstone inclusions in the gemmological field using high spatial resolving power of a laser, and many major gemmological laboratories started introducing this technique recently.
Raman spectroscopy is used to analyse samples in several micrometer size or localised area, and to identify inclusions in a gemstone with its high spatial resolving power. When fluorescence is detectable like a diamond, this technique is used as a photoluminescence analysis. The photoluminescence method is currently the most effective way to detect HPHT process in a diamond. GAAJ has been utilising this instrument for colour origin examination of diamond in routine laboratory work since its introduction the first among the domestic gemmological laboratories in December 2000.
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| Raman system-model 1000 |
inVia Raman Microscope |
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