Obsidium, Elementium and Pyrite are not the only ore you can prospect for profit.
It took me a week to buy one hundred stacks of iron ore. You can farm lots of Iron ore in Ferales.
This is the resulting amount of uncommon gems after the prospecting. It will take some time to sell all these but with lots of people switching from their mains to levelling alts and professions I hope to sell them all over the next two weeks.
Results of Prospecting 2000 Iron Ore:
144 lesser moonstone
22 star ruby
Using Tuj EU mean data
Lesser moonstone 2.96
Star ruby 8.73
Cost of Iron ore mean 38.58g/stack x 100 stacks = 3858g
Jade = 2017.66
L.Moon = 426.24
Citrine = 1684.68
Star ruby = 192.06
Aquamarine = 154.44
Total value = 4475.08
Potential profit = 617.08 Not great profit
Using my realm data
Took me a week to buy 100 stacks because I only bought ore that was below 14g/stack.
Cost is 14 x 100 = 1400g
Jade = 2370
L.Moon = 403.2
Citrine = 695
Star Ruby = 129.8
Aquamarine = 113.4
Total value = 3711.4
Potential profit = 2311.4 Nice profit from 1400g investment.
What you might want to look into doing :
Farm iron ore, sell it raw
Farm iron ore, prospect ore, sell gems
Buy iron ore, prospect ore, sell gems
Keep an eye out on the price of iron ore and these gems. Use this Auctionator shopping list to get a snapshot of what is going on in this market on your realm.
*** iron ore_Gems
If you go to TUJ -> Enhancements -> Jewelcrafting scroll down to the bottom and you will see a Prospecting Value table which can give you a good idea whether this is worth doing on your realm.