You take or buy a chisel and have to have a high crafting level and then just cut it.
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You can get an Uncut emerald from drops or the Grand Exchange, or coming across them while mining, some monsters that drop Uncut Emeralds are a Combat Level 63 Ork Statue or Combat Level 75 Ogre Statue.
Prices are changing alot for diamonds, but right now an uncut diamond's price is 10,600 gp.
To get uncut diamonds you can get them as a monster drop, from one of the gem stores, buy from other players, or purchase through the grand exchange.
Uncut Dragonstone + 3 Runite Bars
It depends if your watching the cut or the uncut. the cut version has like 29 where the uncut has like 39 episodes.