I am on the email list for Fire Mountain Gems - they have a Jewelry Maker's Newsletter that they send out periodically. The current newsletter talked about how to clean the various gemstones, their hardness, what to use when cleaning them and so forth. Here is a link to the chart on Fire Mountain Gems website: http://www.firemountaingems.com/encyclobeadia/beading_resources.asp?docid=CLEANINGGEMST…
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