OK, the subject is selling ONE by ONE, not selling the BULK or totality of an item.
Let's say you have 5 stone talismans and you want to keep 3 to make something. So you sell only 2 stone talismans.
How do you do it? Can you sell one than sell another one.
If you choose show Diana something you can sell 5 stone talismans.
2 camps:
slawa.cap and I: not possible to sell one by one.
Omninuken: possible to sell one by one, but I won't tell you, nah!
Where is the truth?
Not entirely sure what the problem is, it should quite apparent as soon as you have helped Diana fixing the thingy that allows her to buy the Talismans in bulk.
Diana buys All of One Kind of Talisman or All Talismans.
If you want to make something with the Talismans you have do it before you sell them.
Alternatively, if you need money to make something from a type of Talisman, sell the others, one type at a time. For example, if you want to make a Gold Talisman but do not have enough cash for Gold Ore, sell your Jade, Silver, Gold, and Grand Talismans as individual groups and then buy Gold Ore to make Gold Talismans out of your Stone ones … Note, this is not a profitable exercise ...
You want to know the individual price Diana pays for a type of Talisman for? Note how many you have in your inventory, sell only that type of Talisman and divide the amount she gives by the number of Talismans you had. If the arithmetic is too difficult, use the big calculator you are playing the game on.
Also worth noting, your inventory cannot hold more than 99 of any individual type of Talisman, you lose any you collect after that limit is reached; so you are better off using them or selling them as they are more useful as $