As mentioned in the previous Runescape section, it is not that uncommon to find gems while mining for other ores. If you are still in search of cheap Runescape Gold, just come here and enjoy the cheapest service. However, there are a lot of players who have no interests in the gems and only are after the ore from rocks they are mining. In these cases, players will often drop the gems when they find them in order to make more room in their inventory to hold more ore. Therefore, if they're going to waste anyway, you might pick them up and put them to good use as well!
This activity happens more frequently in areas with higher level (runescape money) ores such as adamantine and runite. However, it is still not uncommon for dedicated coal miners to drop gems as well, especially the more commons ones such as sapphires, opals, and jade. Your best bet for finding gems this way is to go to a heavily populated mining area with a lot of rocks. Then, just keep a good eye out for sparklies lying on the ground.