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There is a guide that talks about where to find the yellow gem here:
http://catacomber.com/discussion/7/hero-of-lukomorye-ii-argimons-guide-to-mad-dwarves-castle#latest
Here is my map of where the Gray and Yellow Stones are.
Then you must have gotten it and dropped it somewhere or stashed it somewhere. The stones can't be sold.
Comments
There is a guide that talks about where to find the yellow gem here:
http://catacomber.com/discussion/7/hero-of-lukomorye-ii-argimons-guide-to-mad-dwarves-castle#latest
Here is my map of where the Gray and Yellow Stones are.
Then you must have gotten it and dropped it somewhere or stashed it somewhere. The stones can't be sold.