What did it mean to have a man who could tell 100% whether there was an emerald inside the ores?

Giovanni was well aware.

This meant supreme wealth.

This meant reaching the heavens in a single bound, an overwhelming advantage.

Would he still need to work so hard to operate the Golden Tower in such a desolate area with such a mysterious person by his side? Did he still have to engage in that cosmeceutical business? And, did he need to take the risk to create that new poison?

No, only a foo