Diamond classification - the diamond types

NDT breaking the 10 carat barrier: World record faceted and synthetic diamonds investigated

Large amount of pink and blue CVD- grown synthetic diamonds on the market

Detecting synthetic CVD-diamond with GemmoRaman-532SG™

Detecting HPHT treatment of natural type IIa colorless diamonds

Jade - Identifying jade type and possible polymer impregnation

Determining color origin of cultured freshwater pearls

Characterizing emerald types by chromium photoluminescence

"Topazospinel" - A cautionary tale about contamination

Quick identification of pezzottaite

Determining color origin of red coral & conch pearl

Separating natural unheated spinel from synthetic and heat treated spinel

MAGI announces new GemmoRaman-532SG spectrometer

Sep. 9. 2013

MAGI has recently delivered it's first GemmoRaman-532SG system to the National Assay Office of Latvia. Specifically designed as a custom system, the GemmoRaman-532SG represents the most advanced gemological photoluminescence and Raman spectrometer currently on the market at a reasonable cost.

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Raman Demystified

Mar. 9. 2012

Most gemologists have some difficulties understanding FTIR, UV-VIS-NIR, LIBS, SIMS, LA-ICP-MS and other advanced alphabet soup techniques used in modern gemological laboratories. Raman is different - from gemologist's point of view it really doesn't differ much from classical crossed filters technique. Sample is excited with monochromatic light source and the spectrum exhibits "emission lines" at higher wavelengths just like studying fluorescence. These Raman peaks constitute a diagnostic fingerprint for material identification. The only problem is the inherent weakness of the Raman effect. Traditional spectroscope and human eye can't see the lines no matter how hard you try...

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Limitations of Raman spectrometer

Feb. 9. 2012

While GemmoRaman-532™ is excellent tool for identifying gemology related materials it would be unethical to market it as black mystery box without limitations. Of course it does have them. Every analytical instrument ever made has applications where it shines like a star and then some other fields it simply doesn't work. First of all, we would like to point out this is relatively low cost product being raman spectrometer. It is very good for general identification purposes but it should not be compared to research grade Ramans having ten or twenty times higher fiqures on their price tag.

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For immediate release: GemmoRaman-532 is now available

Sep. 19, 2012, Helsinki - Rome

M&A Gemological Instruments Ltd (MAGI) has launched world's first fully automatic Raman & Photoluminescence spectrometer for gemological identification & analysis.

Read the press release...

Links

CrystalSleuth software download

GemologyOnline Forum

Ocean Optics

NIST Chemistry WebBook

Raman databases

RRUFF Database of Raman Spectroscopy

Raman DB - Parma University

Mineral Raman Spectra - Ens de Lyon

Mineral and inorganic Raman spectra - AIST - Japan

ColoRaman - Luminescence Dating Laboratory

Raman DB - Siena University

Romanian Database of Raman Spectroscopy