Btw, has anyone given the curious wording ("a flawless gem for at least xyz gp") some thought? If the usability of a diamond for this purpose is coupled to its price, then after a war of plague the demands of size and quality of diamonds would be reduced. Market forces drive the price up, so for the necessary amount of gold only lower quality stuff is now available. RAW transform these inferior gems now intofunctional ones.
Even weirder would be a situation where a party with a corpse comes into town only to find the jeweler with tiny shards. "Hey, please accept our 500 gp for your inferior merchandise! We need a 500 gp diamond."
Yep. To avoid that confusion, I convert the GP requirement into a carat weight requirement. So, "a flawless gem for at least xyz GP" becomes "a flawless gem for at least xyz carat weight".
The easiest way to do that is to divide GP value by 200-300, depending on your preferences. It isn't perfect- gemstone values are nonlinear; they jump at certain carat weights, and are also affected by cut, color, clarity and gemstone type- but it's good enough for a game.
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