buying, upgrading and reselling doesn't work. if not the prices themselves, the 15% cut burns your potential profit, so i fear this app is kinda useless. :/
Not true, I have been consistently selling Perfect Star Topaz between 20-300k profit, this app assists me in deciding when at what price to purchase tomes and gems so that I can sell my gems. I would not have spent the time to make myself a calculator if I was not using it.
The 15% cut is already factored into the selling price.
The only gems that are not worthwhile upgrading are anything below flawless gems which is why they have been emitted from calculations.