Prior to the introduction of the Grand Exchange, the examine text on uncut stones said 'This would be worth more if it was cut'. However after the Grand Exchange was introduced, such description no longer matched the actual market facts and thus this was changed.
Although formally released on 8 May2001, uncut gems were briefly obtainable following the 17 March 2001 cooking update, before the crafting skill was fully implemented.
Up to eight uncut sapphires can be mined within a cave found north-west of Rellekka during the Tale of the Muspahquest. These rocks will not respawn for the player once they've been mined.