Most likely Mythic items, a tier of items so powerful that you could only equip one Mythic item at a time, fitted this trade category.Unable to Trade: You can’t trade this type of item at all, instead it’s bound to you the moment it drops for you.Most likely Set and Legendaries tier items fitted this trade category.Limited Trading: You could trade a specific item only one time and then it’s no longer tradable.Most likely Normal, Magic, and Rare Tier items fitted this trade category.Unlimited and free: You could trade the item in question as many times as you want.Normal → Magic → Rare → Set → Legendary → MythicĪlso the trading system was split between three categories: Well the quote Avalon posted was from 2019 BlizzCon, which was when the item tiers for Diablo 4 were the following:

I wonder, what are those “MOST POWERFUL” things in the game in blizzards vision. So you can kinda see, just like with these very simple kinda gradient of things and options here, where we kinda do the call off when do something becomes a one-time trade, or a never trade - we have a lot of flexibility there and we are going to be listening to you, guys, in kinda getting that feedback as well. You have to go do those end-game dungeons, and kill monsters, etc.

and then, we are also thinking that– probably - the highest quality, most powerful things in the game, especially in that area, there should be items that you can’t trade at all. So things like that can only be traded one time. I use it for a year, and then I’m like: “I don’t want this item anymore ” and I give it to Angela. and then, we can also have a class of items that are tradeable one time. So the idea is that we have kinda three different types of tradeable items, so to speak: there is a class of item (a bunch of items) that can always be traded, no matter what, freely. So our current strategy is this, and you know, it is still early days - so we really want to hear your feedback on this in particular. But with that in mind, we also do want to allow trading. So we want to make sure that whatever we do, we kinda respect that part of Diablo. Zaven: Our underlying philosophy here is we think it is the best when you can kill a monster, and get loot that way.

Trade the junk all you want the good stuff not so much

Blizzard explains diablo 4 loot