None that I know of, but buy rubies at the gem shop in falador.
Kill creatures, they drop them rarely.
these are drop by various creatures or can be grown by snapdragon seeds(requires 62 farming)
The most expensive drop you can get on runescape is the corrupt dragon battleaxe at 3.9m
bones
If you mean money then you can do many things like spin flax, make leather, kill creatures that drop good items and other things like farming.
They will attack you, and they can drop loot. see this page: http://www.tip.it/runescape/index.php?rs2monster_id=238
no such thing as rubys in minecraft
the strange rocks may be called gems there are sapphires are blue, emerald are green, rubys are red, and diamonds are white/ clear some people say. but if you do not want these rocks just drop them they are used for crafting u craft them in cut gems. if you do not want them drop them or sell them in GE people may pick them up or buy them
No.
hill giants and hobgoblins drop them sometimes
Right click the rocks and say "drop".
To drop items, you go to your inventory, right click on the item you want to drop, then use the drop command.