You can't. You can only obtain it by mining gems, lucky when mining ore, killing or buying.
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.
You don't. You can either mine it, buy it, or get it as a random event prsent.
a sapphire from an uncut sapphire by using a chisle on it, and smelt a gold bar into a sapphire necklace.
Lvl 82 Skeltons can drop uncut oynx but vary rare
To cut diamonds, use a chisel on an uncut diamond in RuneScape. Further cut diamonds can be cut into bolts for rangers.
Prices are changing alot for diamonds, but right now an uncut diamond's price is 10,600 gp.
The Gachala Emerald is the uncut emerald crystal weighing 858 carats (172 g) that is at the Smithsonian.
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.
As of February 08, 2013, an uncut diamond is worth 6,818 coins.
Uncut Dragonstone + 3 Runite Bars
Common one are a green and are not clear.
A piece of Diamond that has not been cut and is able to be cut with a chisel.