I just found a small mistake in my Jewelcrafting spreadsheet. I had forgotten about cut uncommon gems. They were all set to 15 gold value from when I was making it work. The impact on this should be insignificant. The highest value use of uncommon gems is usually enchanting materials or obliterum. In some cases this might have very slightly underestimated the value of prospecting the ore.
Corrected version: Lazy-Goldmakers-JCENCH-Spreadsheet-TSM-API
I’ve republished the corrected version now. The google version has not been corrected yet (will most likely get to it tomorrow).