You also have to keep in mind that the players do not have "hands on" what they find in the game or what they do. Just like the scenario presented earlier where a player says that he is charging the enemy but the DM says you fall into a pit that you forgot and die is actually very similar to this case. Why would the players even trust the judgement of a blacksmith on the value of a ring instead of a jeweler?
If the players are selling things for gold, they aren't just plunking down a bag and giving it to the smith. He's going to inspect the armor after the PC's take out the armor and watch him. The DM should have reminded the players just what they were doing.
Blacksmith: Hmm, this is an interesting suit of armor you have. It is well made, but the gauntlets seem to be a bit different than the rest of the armor with strange writings on them. Are you selling the entire set of this adamantine armor as well as these strange gauntlets and ring attached to it?
Player: Yes, that is that agreed upon deal.
That's a bit different than the scenario that seems to have happened.
Blacksmith: Do you want to sell the whole set of armor? (not mentioning the ring or gauntlets that don't quite match the rest of the armor)
Player: Yes, that is the agreed upon deal.
If the players are selling things for gold, they aren't just plunking down a bag and giving it to the smith. He's going to inspect the armor after the PC's take out the armor and watch him. The DM should have reminded the players just what they were doing.
Blacksmith: Hmm, this is an interesting suit of armor you have. It is well made, but the gauntlets seem to be a bit different than the rest of the armor with strange writings on them. Are you selling the entire set of this adamantine armor as well as these strange gauntlets and ring attached to it?
Player: Yes, that is that agreed upon deal.
That's a bit different than the scenario that seems to have happened.
Blacksmith: Do you want to sell the whole set of armor? (not mentioning the ring or gauntlets that don't quite match the rest of the armor)
Player: Yes, that is the agreed upon deal.