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GemmoRaman https://www.gemologyonline.com/Forum/phpBB2/viewtopic.php?f=11&t=16730 |
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Author: | Alberto [ Tue Nov 11, 2014 5:41 pm ] |
Post subject: | Re: GemmoRaman |
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. |
Author: | Conny Forsberg [ Wed Nov 12, 2014 4:23 am ] |
Post subject: | Re: GemmoRaman |
A confocal micro Raman unit is costing from USD 70K to 250K. The price for GemmoRaman-532 can be found at their website. |
Author: | Barbra Voltaire, FGG [ Sun Nov 30, 2014 4:25 pm ] |
Post subject: | Re: GemmoRaman |
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. Quote: 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? |
Author: | mikko [ Mon Dec 01, 2014 9:34 am ] |
Post subject: | Re: GemmoRaman |
Quote: 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. |
Author: | energyos [ Sun Dec 21, 2014 12:08 am ] |
Post subject: | Re: GemmoRaman |
Is it possible to use liquid nitrogen to cool the sample with this device? |
Author: | Alberto [ Sun Dec 21, 2014 5:06 am ] |
Post subject: | Re: GemmoRaman |
hi energyos wrote: 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 |
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