Gem Silica is a rare blue green variety of chalcedony that gets its coloring from the presence of copper. Some of the nicer quality material is found in Arizona. I received a couple of trimmed pieces to cut for Paul, owner of The Rare Rock Shop in Southern Utah. I go through the cutting process showing how I cut these gemstones.


Pages that I use for free faceting diagrams
https://facetdiagrams.org/
https://www.gemologyproject.com/wiki/...


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