PoE Blacksmith’s Whetstone Guide: Vendor Recipes, Farming, Weapon Quality & How to Get It

Blacksmith’s Whetstone is a common currency item in Path of Exile used to improve the quality of weapons. Increasing weapon quality boosts physical damage and can improve the chances of obtaining more sockets and links.

In Path of Exile 3.29, Blacksmith’s Whetstones remain useful for weapon crafting, leveling, and vendor recipes. However, several mechanics have changed since older versions of the game.

Most importantly, since Patch 3.25, the amount of quality added by a Blacksmith’s Whetstone depends on the weapon’s item level rather than its rarity, except for unique weapons.

This guide explains how Blacksmith’s Whetstones work, all important vendor recipes, how to farm them, and the most efficient ways to use them.

1. What Is a Blacksmith’s Whetstone in PoE?

Blacksmith’s Whetstone is a stackable currency item that improves weapon quality.

Blacksmith’s Whetstones can be used on swords, axes, maces, bows, daggers, claws, wands, sceptres, staves, and other eligible weapon types.

They do not improve armour, flasks, or skill gems. Those item categories use different quality currencies.

How to Use a Blacksmith’s Whetstone

Right-click a Blacksmith’s Whetstone in your inventory, then left-click the weapon you want to improve.

The weapon’s quality increases according to its item level, or by 1% if the weapon is unique.

You can continue applying Whetstones until the weapon reaches 20% quality.

Weapons that already have 20% or higher quality cannot have their quality further increased with ordinary Blacksmith’s Whetstones.

2. How Much Quality Does a Blacksmith’s Whetstone Add?

The most important change occurred in Patch 3.25.0.

Previously, Whetstones increased weapon quality according to rarity:

The old 5%/2%/1% rule is outdated for non-unique weapons.

Under the current system, very low-item-level weapons can receive 20% quality from a single Whetstone. As item level increases, the quality gained per application decreases.

High-item-level equipment generally requires substantially more Whetstones to reach 20% quality.

Unique weapons are an exception. They always receive 1% quality per Whetstone, regardless of their item level.

Does Weapon Rarity Matter?

For normal, magic, and rare weapons, rarity no longer determines how much quality is added.

For example, if a normal sword and a rare sword have the same item level, their Whetstone quality gains follow the same item-level-based system.

This means the old advice to always increase a weapon’s quality before upgrading it from normal to rare is no longer necessary for saving Whetstones.

3. Blacksmith’s Whetstone Vendor Recipes

There are two main vendor recipes for obtaining Blacksmith’s Whetstones.

Both recipes remain available in Path of Exile 3.29.

Recipe 1: Sell a Normal Weapon With 20% Quality

This is the simplest Blacksmith’s Whetstone vendor recipe.

Find a normal weapon that has 20% quality, place it in an NPC vendor’s sell window, and receive one Blacksmith’s Whetstone.

For example:

This recipe works with eligible weapon types and does not require a specific item level.

It is especially convenient when you find 20%-quality normal weapons that you do not intend to equip or craft.

Recipe 2: Sell Weapons With 40% Combined Quality

You can also obtain a Blacksmith’s Whetstone by selling multiple weapons whose combined quality reaches at least 40%.

Unlike the first recipe, this method allows weapons of any rarity.

For example:

Selling these three weapons together returns one Blacksmith’s Whetstone.

The combined quality can exceed 40%, but additional quality beyond the recipe’s threshold does not increase the reward.

Why Don’t 80% Quality Weapons Always Give Two Whetstones?

A common mistake is assuming that selling weapons with 80% total quality automatically produces two Whetstones.

The vendor must be able to form separate qualifying recipe groups. Simply reaching 80% across all items does not guarantee two results.

For example, the following weapon qualities add up to 80%:

19% + 13% + 15% + 9% + 17% + 7% = 80%

However, these values cannot be divided into two groups that each reach at least 40%.

The safest method is to organize your weapons into separate groups that each reach exactly or slightly above 40%, then sell those groups individually.

For example, selling 20% + 12% + 8% gives one Whetstone, and another group of 18% + 12% + 10% gives a second Whetstone.

4. How to Get Blacksmith’s Whetstones in PoE 3.29

There are several ways to obtain Blacksmith’s Whetstones, including monster drops, vendor recipes, NPC purchases, divination cards, and trading.

Method 1: Farm Monsters and Currency Drops

Blacksmith’s Whetstones have a drop level of 1 and belong to the general currency drop pool.

They can drop throughout the campaign and endgame.

The easiest way to farm them naturally is to kill monsters, open containers, and collect the currency drops encountered during ordinary gameplay.

Running maps with increased monster density or additional currency rewards can provide more opportunities to obtain Whetstones alongside other valuable currency.

However, there is no need to farm a specific boss or map exclusively for Blacksmith’s Whetstones.

Method 2: Use the 20% and 40% Vendor Recipes

Vendor recipes provide a reliable alternative to random drops.

Keep an eye out for normal 20%-quality weapons and lower-quality weapons that can be combined into 40% groups.

These recipes are useful during the campaign and early mapping, when a Whetstone can help improve your weapon or create a leveling item.

An efficient approach is to save quality weapons temporarily and sell them when you have enough to complete a recipe.

Method 3: Purchase Blacksmith’s Whetstones From NPC Vendors

Blacksmith’s Whetstones can also be purchased from weapon and armour vendors starting in Act 2.

Greust is located in the Forest Encampment.

This exchange is convenient if you have spare Armourer’s Scraps but need Whetstones for weapon upgrades.

Other eligible vendors later in the campaign may offer the same exchange.

Method 4: Obtain Whetstones From Divination Cards

Certain divination cards can reward Blacksmith’s Whetstones indirectly.

The Master Artisan is particularly relevant because it rewards a stack of quality currency.

However, it does not guarantee Blacksmith’s Whetstones. Other quality currencies may be awarded instead.

A completed set of five Master Artisan cards provides 20 currency items of one randomly selected quality-currency type.

Method 5: Farm Artisan’s Strongboxes

Artisan’s Strongboxes are another way to obtain quality-related items.

They can provide Blacksmith’s Whetstones, Armourer’s Scraps, and other quality currency.

They are also associated with The Master Artisan divination card.

Opening Artisan’s Strongboxes while progressing through maps can supplement your Whetstone supply without requiring a dedicated farming strategy.

Method 6: Trade for Blacksmith’s Whetstones

In trade-enabled leagues, you can exchange other currency for Blacksmith’s Whetstones.

Faustus provides access to the in-game Currency Exchange Market, where eligible currencies can be bought or sold through exchange orders.

You can also use the official Path of Exile Trade website to look for player listings.

Exchange rates depend on the league, platform, supply, and demand.

There is no permanent Chaos Orb-to-Whetstone exchange rate. Older guides that quote a fixed ratio, such as 1 Chaos Orb for 8 Whetstones, should not be treated as current pricing.

Check the actual market before trading.

Method 7: Buy Blacksmith’s Whetstone From U4GM With a 6% Off Coupon Z123

For players considering a third-party purchase, U4GM lists Blacksmith’s Whetstone among its Path of Exile currency products.

You can buy Blacksmith’s Whetstone from U4GM and use the 6% off coupon: Z123 at checkout.

The coupon is particularly relevant when purchasing multiple types of PoE currency for weapon crafting and other upgrades.

Coupon code: Z123 — 6% OFF. Confirm coupon eligibility and the final discount during checkout, since the code’s acceptance has not been independently verified.

5. Blacksmith’s Whetstone Crafting Recipes

Blacksmith’s Whetstones are not only used to improve weapon quality. They are also ingredients in vendor recipes that create magic weapons with useful damage modifiers.

Recipe 1: Increased Physical Damage Weapon

One of the most useful leveling recipes combines a weapon, a Rustic Sash, and a Blacksmith’s Whetstone.

Result: A magic weapon with an increased physical damage modifier.

The modifier tier depends on the rarity of the Rustic Sash.

These ranges overlap, but the recipe can provide a useful physical damage modifier for early weapon upgrades.

This method is particularly valuable for melee and bow characters during the campaign.

Keep in mind that the recipe creates a magic weapon and replaces its existing explicit modifiers. Avoid using an already valuable rare weapon as the ingredient.

Recipe 2: Increased Spell Damage Weapon

Blacksmith’s Whetstones can also be used in a recipe for spellcaster weapons.

Result: A magic weapon with an increased Spell Damage modifier.

The modifier tier is affected by the rarity of the Chain Belt, with higher-rarity belts allowing stronger recipe outcomes.

This recipe is useful when leveling spellcasters and looking for an accessible weapon upgrade without spending more valuable crafting currency.

Unlike directly applying a Whetstone to a weapon, this recipe creates a spell damage modifier rather than merely increasing the weapon’s quality.

Recipe 3: Exchange a Whetstone for Scrolls of Wisdom

A Blacksmith’s Whetstone can also be sold to a vendor for four Scrolls of Wisdom.

This can be useful if you run out of identification scrolls during the early campaign.

However, Whetstones are generally more useful for weapon upgrades and crafting, so consider preserving them if you need those functions.

6. How Much Damage Does 20% Weapon Quality Add?

Weapon quality increases the weapon’s local physical damage.

Since Patch 3.25, the quality bonus is multiplicative with local physical damage modifiers.

At 20% quality, a weapon gains 20% more physical damage than it would have at 0% quality, assuming all other properties remain unchanged.

For example:

In this simplified example, upgrading the weapon from 0% to 20% quality increases its physical damage by 20%.

The exact damage displayed in-game may differ slightly because of rounding.

This bonus can be especially valuable for builds that scale their attack damage from the weapon’s physical damage.

Does Whetstone Quality Increase Elemental Damage?

Ordinary weapon quality does not directly increase local fire, cold, lightning, or chaos damage values.

For example, if a weapon deals both physical and lightning damage, increasing its quality normally improves the physical portion, not its separately listed lightning damage.

However, skills that convert physical damage into elemental damage may still benefit because the underlying physical damage has increased.

Similarly, ordinary weapon quality generally does not directly improve spells that do not use the weapon’s local physical damage.

Certain special enchantments can alter how quality affects equipment, so check the item when dealing with advanced crafting.

7. Does Weapon Quality Improve Sockets and Links?

Yes. Weapon quality affects the probability of obtaining more sockets or links when using Jeweller’s Orbs and Orbs of Fusing.

Each 1% quality improves the relevant crafting result by 1%.

For example, a weapon with 20% quality receives a 20% relative improvement to the relevant socket or linking probabilities compared with an otherwise identical weapon at 0% quality.

This does not mean the weapon has a 20% absolute chance of obtaining six linked sockets.

It means quality improves the underlying probability.

Quality is also no longer consumed when using Jeweller’s Orbs or Orbs of Fusing.

What Changed in PoE 3.29?

Patch 3.29 changed the socket-colour system.

Equipment sockets are now generally white by default, and gems can be placed into sockets without matching their colours.

Matching a coloured gem to a socket of the same colour instead grants additional gem quality.

This is separate from the weapon quality granted by Blacksmith’s Whetstones. Whetstones do not grant that socket-colour matching bonus.

8. Can You Increase Weapon Quality Above 20%?

Yes. Some weapons can have quality above the ordinary 20% limit, but regular Blacksmith’s Whetstones cannot raise quality beyond 20%.

Since Patch 3.25, non-gem equipment that generates with random quality can roll up to 30% quality.

This makes naturally dropped high-quality weapons potentially useful for players who want to maximize weapon damage.

At 30% quality, an eligible weapon can receive 30% more local physical damage from quality, assuming it uses the normal weapon-quality effect.

Specialized crafting and item mechanics may also interact with quality.

However, older guides describing the Bestiary recipe that corrupts a weapon directly to 30% quality are outdated. That equipment recipe was replaced in Patch 3.25.

The former Cartographer’s Chisel recipe involving a hammer, Whetstone, and map is also obsolete. Vendor recipes granting Cartographer’s Chisels were removed in Patch 3.28.

9. Can You Use Blacksmith’s Whetstones on Unique or Corrupted Weapons?

Unique Weapons

Blacksmith’s Whetstones work on eligible, uncorrupted unique weapons.

Each application increases quality by 1%, regardless of item level.

Therefore, increasing an uncorrupted unique weapon from 0% to 20% quality requires 20 Whetstones.

This can be a straightforward upgrade for physical-attack builds using unique weapons.

Corrupted Weapons

Normal Blacksmith’s Whetstones cannot be used to improve corrupted weapons.

Instead, corrupted weapon quality can be modified using Tainted Blacksmith’s Whetstones.

A Tainted Blacksmith’s Whetstone randomly changes a corrupted weapon’s quality, with a maximum random quality of 20%.

These items can drop from Beyond monsters, with Beyond bosses providing opportunities to obtain Tainted Currency.

Unlike an ordinary Whetstone, a Tainted Blacksmith’s Whetstone does not guarantee that quality will increase.

10. Blacksmith’s Whetstone FAQ

What is the fastest way to get Blacksmith’s Whetstones?

For most players, the easiest methods are collecting natural currency drops and selling quality weapons through the 20% or 40% vendor recipes.

In trade-enabled leagues, the Currency Exchange can be a convenient option when you need a larger quantity.

What is the Blacksmith’s Whetstone recipe in PoE 3.29?

Sell one normal weapon with 20% quality, or multiple weapons with at least 40% combined quality, to an NPC vendor. Both recipes reward one Blacksmith’s Whetstone.

How many Blacksmith’s Whetstones are needed for 20% quality?

For non-unique weapons, the number depends on item level.

Very low-item-level weapons may reach 20% quality with one Whetstone, while high-item-level weapons require more.

For unique weapons, 20 Whetstones are required to increase quality from 0% to 20%.

Can I use a Blacksmith’s Whetstone on a rare weapon?

Yes. Whetstones work on normal, magic, rare, and unique weapons, provided the weapon is eligible and not corrupted.

Does Blacksmith’s Whetstone increase DPS?

It can increase DPS for attacks that benefit from a weapon’s local physical damage.

The actual improvement depends on your skill, weapon, damage conversion, and build.

Does Blacksmith’s Whetstone increase spell damage?

Not directly. Ordinary weapon quality increases local weapon physical damage.

For spellcaster weapons, the vendor recipe combining a weapon, Chain Belt, and Whetstone can instead produce a magic weapon with an increased Spell Damage modifier.

Can I still use The Sharpened Blade prophecy?

No. The Sharpened Blade prophecy is no longer available in the current game.

The prophecy system was removed in Patch 3.17.0, so the old method of using a prophecy to increase weapon quality with one Whetstone is obsolete.

Can I convert Blacksmith’s Whetstones into Glassblower’s Baubles?

The old NPC exchange requiring eight Blacksmith’s Whetstones for one Glassblower’s Bauble is no longer a current vendor-purchase method.

Patch 3.25 removed NPC purchases that required quality currency and stopped vendors from selling Glassblower’s Baubles.

Use the Currency Exchange or other current acquisition methods instead.