GemmoRaman

[Alberto]

You asked for the possibility of scanning inclusions inside gemstones, that is something it can be done only by using Confocal MicroRaman units, GemmoRaman is not a confocal unit so its not possible to scan inclusions. 2 examples of units used for that task are this one: http://www.thermoscientific.com/content ... scope.html which i use on daily bases and it costs around 90-100.000 $ depending on the configuration and this one: http://www.renishaw.com/en/invia-confoc ... cope--6260 which can cost even more than 230.000 $ if equipped with multiple laser setup.
hope this will clarify the situation a bit.

[Conny Forsberg]

A confocal micro Raman unit is costing from USD 70K to 250K. The price for GemmoRaman-532 can be found at their website.

[Barbra Voltaire, FGG]

Question.
Treated chalcedony to make it black. (often referred to as black onyx)
Is this treatment detectable with the Gemmoraman?
In an article in G&G, 2003, Fall, there was a confusion about whether some black chalcedony was treated, or I should say a confusion as to HOW to prove it.

To support this conclusion, we analyzed the material with the Raman spectrometer. The presence of two distinct peaks, one at 1600 cm−1 and the other centered at 461 cm−1, identified the black material as chalcedony and indicated the presence of a carbonized compound (sugar). In addition, infrared spectroscopy showed two peaks at approximately 2235 and 2133 cm−1, which our research has found indicate that the color is the result of treatment by sugar and acid (and/or heat). This material is typically known in the trade as black onyx.

Is this a conclusion you have confirmed with the GemmoRaman?

[mikko]

Is this a conclusion you have confirmed with the GemmoRaman?

We have seen the 1600 cm^-1 peak in treated black chalcedony, but whether it shows up in all the treated samples or not is unclear at this point. To clarify the editing of G&G- article: 461 cm^-1 peak only indicates the sample is quartz. Chalcedony has an additional smaller peak or shoulder at 501 cm^-1 (moganite) which the article does not mention. The 1600 cm^-1- peak indicates the presence of carbonized sugar.

[energyos]

Is it possible to use liquid nitrogen to cool the sample with this device?

[Alberto]

hi

Is it possible to use liquid nitrogen to cool the sample with this device?

yes, by using this Kit: http://www.gemmoraman.com/Products/LNKit.aspx