I may as well sign up to this. I have a load of stuff lying around I wrote just to help me learn (I find it easier to learn if I research things, and write them in essay-ish form).
I would be interested in signing up for this as well. I noticed a few things I can add quickly from the "Wanted pages" section from the Gem-A books or otherwise. I can possibly find some pictures from my collection of the teaching stones I've been using at the CGA as well to add a couple.
On another note, for a research project for the CGA the topic I chose was Visual Optics and I noticed the section in there is a little lacking. I could potentially revamp most of the information into something for the wiki as well. Most of the information was drawn from either Alan's Gem Testing Techniques book or through various periodical articles from the past when it was first being introduced.
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