Apologies to OP if this is an unwarranted addition to this thread, but I thought to add some more to cost effective upgrading and a bit more explanation to newer players; it took me quite some time to understand the whole upgrading system in RoM. I wish to expand this discussion, and go in better detail on how this all works. If you are a combine vet and are pro about all this (or super rich), stop reading here. Anyways, the OP was very very helpful, much thanks! Anyhoo....onwards!
Another trick is to just use 1 stat fusion stones like 3 stam...around 200-250k per on my server. Pretty expensive perhaps. But compared to min 550k gold if you were to buy diamonds off the AH and then purchase a puri stone and or buying already made expensive mana stones...it is cheaper, allowing you to save valuable gold, diamonds, and puri stones for real gear later. You can even send the materials to a lvl 10 alt who farms tokens every day so it can combine as well, thus cutting costs down more. Every three days per alt = 10 free transmutor charges.
Essentially you can also make a 1 dirty, 5 good stat gear using quest rewards and loots. Make sure all the stat levels/types but the dirty are different! If you use 2 of the same, it will take the lowest one and null the other. That is no good! Also watch out when you are ripping 2 stat items, it might make a different tiered mana stone which I did once by mistake; always check window in transmutor first.
~Method using 3 stam fusion stone to create a simple 6x green stat item~
Combine 3x mana stones Part 1,2,3:
1 stat fusion stone + rip one stat from an item.
1 stat fusion stone + rip one stat from an item.
1 stat fusion stone + rip two stats from an item.
Combine Part 4:
Mana stone 1: 3 stam - X stat
Mana stone 2: 3 stam - X stat
Mana stone 3: 3 stam - X/X stat
Item you wish to upgrade with X stat already on it
(note: X stat = the stat(s) you want)
Hit confirm and now you have an item with 3 stam/X/X/X/X/X! Yay!
If you are hurting for cash, diamonds, and gear...this is a less expensive way to get mid ranged upgrades. If you are poor like me, it will save you many millions of gold. Sure not even close to the best uber gear, but it's ok I guess until you can afford better. Anyways....in theory, one could also apply this method to yellows and create an item with even more stats in a more complex process; 1 dirty and 10 yellows without even using a puri? The loss of 1-2 stats would not make it perfect, but heck if you are on a budget...this would be awsome. Not sure, though, if this would work atm: I can't afford or have access to materials needed to test this quite yet.
Side note...keep an eye out on the AH for cheap 2 stated items and also 2 stat mana stones, sometimes you can make the process cost less (this is rare though).
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First screenshot using 1 stat fusion stone method = 600k-750k using AH fusion stones.
Second screenshot using 2 stat fusion stone method (visual example for the OP) = 180k-220k using AH fusion stones.
As you can see, 1 stat fusion stone costs way more than the process using 2 stat; you pay more for one extra stat...it's up to you in the end on how much you want to spend. Using puris to make a perfect 6 stat item would cost aprox 1.8-3 mill in AH bought diamonds...good deal? You be the judge! Lastly, I made these as a temporary gear upgrade and too test the OPs suggestions since I was still unsure exactly how all this transmuting business works. Now I know and hopefulley you do to! All the stats I used here were gained while questing and grinding Ravenfall, WC, and SL.
Sorry for the long post, I hope this helps someone. Thanks for reading.