It is possible to farm this RS gold item only during Gargoyle that also permits fighting with your boss. In the aftermath of the battle, guardians could give away granite items, among which granite gloves as well as the granite hammer are most valuable. There is also a 1/1000 chance that Black Tourmaline Core drop which could fetch several million dollars.
One of the most well-known minigames in OSRS involves a battle against Six Barrows Brothers which while not to be a danger to an experienced player , could pose an imminent threat to novice adventurers. You can encounter Ahrim the Blighted (level the 98 level Mage), Dharok the Wretched (level 115 Warrior), Guthan the Infested (level 115 Warrior), Karil the Tainted (level Archer 98), Torag the Corrupted (level 115 Warrior) and Verac the Defiled (level level 115 Warrior).
Those who aren't afraid of this challenge are able to dig up graves (don't worry no need to carry a shovel because there's one in that site) which buy Runescape gold the Morytania Swamps are known to hide. There are ancient graves that are now home for those seeking revenge.