Start 1-99 crafting by talking to the "Restless Ghost" at home-
Start by crafting Uncut Opal's from level's 1-34-
Next craft Uncut Ruby's from level's 34-55-
Now craft Uncut Dragonstone from level's 55-99, and you should make about a 10m profit at most and it won't take to long.
Goodluck.