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Gemcutting

"It's every gemcutter's dream to find a priceless gem stuck in the stone. To work the tools with master's grace and extricate a gem that could buy castles. So far my personal best was a diamond worth 235,000 gold pieces. That's incredibly impressive where I'm from." - from the verbatims of Malda Gemkind

Utility

Mechanically speaking, here's how the homebrew gemcutting rules work.

Gemcutting allows you to double the value of a gem by clearing up the cut. The danger is that if you fail the DC you damage the gemstone and it becomes worth only half of its original uncut value. Only gems worth at least 50 gold pieces can be improved.

Gold Range (Present Value of Gem)	Difficulty Rating by Present Value of Gem
50 to 100 gp	DC 10, 1 hour
101 to 200 gp	DC 12, 2 hours
201 to 400 gp	DC 14, 3 hours
401 to 800 gp	DC 16, 4 hours
801 to 1,600 gp	DC 18, 5 hours
1,601 to 3,200 gp	DC 20, 6 hours
3,201 to 6,400 gp	DC 22, 7 hours
6,401 to 12,800 gp	DC 24, 8 hours
12,801 to 25,600 gp	DC 26, 9 hours
25,601 to 51,200 gp	DC 28, 10 hours
51,201 to 102,400 gp	DC 30, 11 hours
102,401 to 204,800 gp	DC 32, 12 hours
204,801 to 409,600 gp	DC 34, 2 days
409,601 to 819,200 gp	DC 36, 3 days
819,201 to a 1,638,400 gp	DC 38, 4 days
1,638,401 to magna crucible status	DC 40, 1 month.