Finding a treatment/method to increase the hardness of gemstones
Category: Science > Chemistry
Asked by: freakingcat-ga
List Price: $200.00
07 Jun 2006 01:18 PDT
Expires: 07 Jul 2006 01:18 PDT
Question ID: 736006
I am working with a mineral called Sphalerite, ZnS, which has a 6-folded cleavage and a hardness of 3.5 to 4. When gemstones are facetted out of this mineral they display a dispersion which is higher than diamond. The problem I am trying to solve is connected with its low hardness. When pressure is applied to the finished gemstone (like when it is set), due to its low hardness and 6-folded cleavage it usually chips on the edges. Further by exposing the facetted sphalerite to bright light and by daily wear it becomes stained and matt on the surface. I am looking for a way to increase the hardness of this material without changing its other physical properties. ZnS has a low temperature resistance point so that when high temperatures are applied, it dissolves into powder. Further its chemical structures change (S). I had been experimenting a lot and came to the conclusion that probably the only way to increase the hardness without effecting the other properties of sphalerites is a very thin coating. Gemstones like pink topaz are already coated to apply a very thin layer of color. My idea is to find a coating which can be industrially applied which is colorless (thus not effecting the optical appearance of the facetted sphalerites) BUT HARD ENOUGH to make it scratch and wear resistable so that it can also be used for setting. One researcher at Bangkok university acchieved a break through when he used as he said a ceramic based coating (mixed out of two ready made and available agents) but this information is not verified. I am accepting as answer for this question the name and seller information of a ready made coating agent which can be used and easily applied on the gemstone which enhances its hardness while not effecting other properties. Further I accept as answer the confirmed contact information of companies who are able to do this gemstone coating (hardening) for customers in a reasonable price range. It is also possible to accept information which show another way that this hardening problem can be solved. Further possible are verified contacts in Thailand (where I live at the moment) who are able to do this kind of hardening treatment. I have already invested quite a lot of time into finding a practical solution to this problem and I am willing to offer not only $200 which is the maximum amount I can select in Google, but $ 1000 for a PRACTICAL applicable solution where the results can be verified. thanks a lot! arthur
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Re: Finding a treatment/method to increase the hardness of gemstones
From: redfoxjumps-ga on 08 Jun 2006 02:27 PDT
I know of firm that made a radiation device to increase the clarity and value of gem stones. Hardness? Don't kno that.
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