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The Great Andesine Scam by Gary Kratochvil copyright 2008
Fabulous Feldspars Colored Stone Magazine Nov - Dec Issue
This entire issue is devoted to feldspars including Oregon Sunstone. One of the featured stones is a 12.10 carat red with schiller cut by Gary Kratochvil. This is a PDF reprint of the article used by permission of Colored Stone Magazine.
Drilling For Oregon Sunstone by Gary Kratochvil copyright 2008
Common Sense Gemstone Grading by Jeff R. Graham copyright 2007