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Quality
Quality is a stat that improves the signature stats of an equipment or adds additional bonuses to skill gems. Each item type has a currency item associated with it that increases its quality.
Mechanics
Quality can be applied to most equipment (quivers, jewels, and belts are the exceptions). Any item with at least 1% quality will have a Superior prefix when dropped on the ground but not when in the inventory.
| Item type | Currency | Effect per % quality |
|---|---|---|
| Martial weapons |  Blacksmith's Whetstone |
1% more Physical Damage |
| Wands and Staves |  Arcanist's Etcher |
+1% to inherent skill quality[a] |
| Sceptres | Arcanist's Etcher |
1% more Spirit +0% to inherent skill quality[a] |
| Armour (equipment) |  Armourer's Scrap |
1% more Defence |
| Amulets and Rings | Catalyst | 1% increased modifier magnitude Modifier tag varies by catalyst |
| Flasks |  Glassblower's Bauble |
1% more Life/Mana Recovery |
| Charms | 1% increased Duration | |
| Skill gems |  Gemcutter's Prism |
Varies by skill |
Charm quality cannot be manually increased, though they can drop with quality and can have their quality modified through corruption.
For items that grant an inherent skill as an implicit modifier, additional quality will also add quality to the attached skill.
Most items which can have quality can have a maximum of up to 20% quality, or up to 23% quality through corruption. 
Breach Rings can have up to 50% quality. Effects which grant a global increase to gem quality can also exceed this cap.
Quality is a unique multiplier to the related stat that is applied after all other modifiers, including the corruption magnitude modifier, and rounding. Values are truncated after the quality multiplier is applied.
Amount
The amount of quality given by a quality-increasing currency item depends on the equipment's item level. The higher the item level, the less quality each currency item will give. Gemcutter's Prisms always add 5% to the skill gem.
Corrupting a flask, charm, caster weapon (staff, wand, sceptre), or skill gem may cause it to gain or lose up to 10% quality, and can exceed the 20% cap, up to 23%. Support gems cannot have quality added to them.
Version history
Notes
- ↑ Jump up to: 1.0 1.1 As of version 0.1.1, inherent skills found on wands and staves now gain an equivalent amount of quality as the weapon itself. This is correctly reflected in the Skills Panel, but is currently not reflected in the gem's hover tooltip.[Likely due to a bug] Global quality effects apply to Wand/Staves and are reflected in both gem's hover tooltip as well as Skills Panel. Sceptres do not currently grant any quality to their inherent skills and their skills are unaffected by global quality modifiers despite them being applied visually on gem's hover tooltip.
