By this point, you've probably noticed that when you sell items to a vendor, you can get an assortment of currency that seems pretty random.
In fact, the currencies that you get are completely determined by the item(s) you're selling. Most importantly, some combinations of items can have results different from the sum of their parts.
This page does not cover all such recipes; there are quite a lot of them. Instead, we'll cover the basic ones that are commonly used by most players and those that are useful for a new levelling character.
Levelling Item Recipes
These recipes are only really used while levelling, but are sometimes very helpful for a low-level character without any existing gear available to them.
- Resistance Rings: Vendoring an Iron Ring with a Skill Gem will give you a ring with Resistance as an implicit stat. An Iron Ring and a red gem will give a Ruby Ring (fire resistance), an Iron Ring and a green gem will give a Topaz Ring (lightning resistance), and an Iron Ring and a blue gem will give a Sapphire Ring (cold resistance). These can be useful for getting your resistances up. The resulting ring is Normal (white) rarity, but you can use an Orb of Alchemy on it to get a Rare version if you want (and you should probably do so if you're using this recipe at all).
- Added Elemental Wands and Sceptres: Vendoring a Magic-quality (blue) Wand or Scepter, a Ruby, Topaz, or Sapphire ring, and an Orb of Alteration will get you a wand with Added <Element> Damage to Spells - using a Ruby ring gets you Added Fire, using a Topaz ring gets you Added Lightning, and using a Sapphire Ring gets you Added Cold. High-quality rings (e.g. rare (yellow) over blue (magic)) will give higher amounts of added damage. If you're playing a Spell build, these are very useful for early levelling.
- Weapon with Increased Physical Damage: Any weapon + a magic (blue) or rare (yellow) Rustic Sash + a Blacksmith's Whetstone will yield a weapon of the same type with Increased Physical Damage. This is useful for levelling an early Attack build. Rare-quality Sashes yield higher amounts of increased damage.
These recipes, especially the +1 Wands and increased-physical weapons, can be very helpful when getting started on a new character. None of these are really mandatory, though, especially if you're fortunate enough to find a good weapon early on.
Note that +1 Chaos and +1 Cold/Fire/Lightning recipes no longer exist. If you're using a guide that references them, it's likely at least somewhat outdated.
Socket Modifier Recipes
Vendoring items with particular numbers or links between their sockets can result in Currency items that allow you modify sockets:
- Chromatic Orb: Vendoring any item with a blue, a green, and a red socket linked together will yield a Chromatic Orb, which rerolls the color of the sockets on an item. Such linked items are very common, and most Loot Filters (including the recommended Neversink filter) will highlight them for pickup.
- Jeweller's Orb: Vendoring any item with 6 sockets (not 6 links) will yield 7 Jeweller's Orbs, which reroll the number of sockets on an item. 6-socket items are not particularly rare, and you should do this recipe any time you find an item with 6 sockets unless that item has some other value (like good stats or 5 or 6 of its sockets linked together). Most likely, you haven't found any such items yet; they won't naturally drop until around Act 6, but when they do your Loot Filter will highlight them as well.
- Divine Orb: Vendoring any item with 6 links, on the other hand, will yield a valuable Divine Orb. However, 6-link drops are very rare, and many 6-links are worth much more than a Divine Orb. This recipe is definitely not worthless, but should be used carefully, since you can potentially lose out on a lot of value if you vendor a high-value 6-link.
Most high-end players do not bother with the Chromatic Orb recipe, as it's rather slow to pick such items up and Chromatic Orbs are not especially valuable. But it's an easy way for a new player to earn some easy currency, and you're likely to be moving slowly anyway on a first character, so I'd recommend you do it (at least while leveling). The Jeweller's Orb recipe is almost always worth your time.
Quality-Upgrade Currency Recipes
There are five Currency items that increase Quality, one for each of the five item types that can have Quality: Armour, Weapons, Flasks, Skill Gems, and Maps.
Vendoring a collection of one of these types of item with a total quality of 40% or more will yield one of the currency type that would upgrade those items. For example, vendoring five Maps with 3%, 12%, 11%, 5%, and 10% Quality (a total of 41%) would result in a Cartographer's Chisel (which upgrades the quality of Maps). Vendoring three Skill Gems with 12, 13, and 17% Quality (a total of 42%) would result in a Gemcutter's Prism (which upgrades the Quality of Skill Gems). Any quality above 40% is wasted (unless you assemble another 40% set).
In general, the items that upgrade weapons and armour are too common for this recipe to be of use. Instead, this recipe is mostly used with Flasks and Skill Gems of low to middling quality (<about 15%), which have little other value.
Maps should be picked up regardless of quality, but are usually not sold in this way, since maps themselves hold some value and there is an easier recipe (introduced later) for Cartographer's Chisels.