Posted by samantha on Monday, November 29, 2010 at 12:01pm.
A long list and a lot of work (for you). Here are a number of sites. From them you should be able to find the information you need.
http://www.google.com/search?q=compositino+genstones&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a#hl=en&client=firefox-a&hs=QGp&rls=org.mozilla:en-US:official&&sa=X&ei=RvvzTLW4MsT7lwfa6rC-DA&ved=0CB8QvwUoAQ&q=composition+gemstones&spell=1&fp=b69933d19f024e3b
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