Fields of Mistria Rare Items — Refined Stone, Faceted Rock Gem & More

The rarest items in Fields of Mistria share one trait: they're all gated behind the mines and the museum. Some — like Refined Stone — are processed materials you craft, others are dig-spot artifacts, forageables, or fish that only spawn in specific mine floors. Most of them are museum-critical, and a few are quest items you should never sell.

This guide covers six of the most-searched rare finds: Refined Stone, Faceted Rock Gem, Jade Dulse, Stone Loach, Freshwater Oyster, and the museum's Fish Wing — what they are, where they come from, and what they're for. For the systems behind them, see the mines guide, the fishing guide, and the museum guide.

Official source: the wiki.gg Items index catalogues Refined Stone, Faceted Rock Gem, Jade Dulse, Stone Loach, and Freshwater Oyster with the item data used throughout this guide.

Refined Stone — The Stone Refinery Product

Refined Stone is a processed material used in dozens of high-level Woodcrafting recipes, construction, and quests. It is not found in the world — you make it:

• Recipe: 10 Stone → 1 Refined Stone at the Stone Refinery
• Craft time: 10 minutes
• Sell price: 22 Tesserae (don't bother — it's worth far more in recipes)
• Donatable: No

Two related skills make it cheaper: Refined Rockery (cuts Stone Refinery craft time by 10 minutes, to 0) and Break One, Get Two (chance of a bonus crafted item). It feeds the Gemstone Bridge, Obsidian furniture, and a long list of stone furniture sets, so hoard it once your forge and refinery are up. Per the wiki.gg Refined Stone page, it's also a gift — some villagers like it.

Faceted Rock Gem — The Deep Earth Artifact

The Faceted Rock Gem is one of the most misleading items in the game: "Despite its mesmerizing, gem-like appearance, it's just a piece of rock," per the wiki.gg item page. It's an uncommon artifact that looks like a jewel but belongs to the museum's Deep Earth artifact set.

• Location: The Deep Earth section of the mines (floors 41-59)
• How to get it: dig Dig Spots in the Deep Earth with any Pickaxe or Shovel; with the Stoneturner skill enabled, breaking rocks there can also drop it
• Sell price: 75 Tesserae — but donate it first; one is required for the Deep Earth set in the museum
• Uses: museum set, gifts, and certain quests

Jade Dulse — The Tide Caverns Seaweed

Jade Dulse is a mines forageable that looks like ocean kelp in a cave — a great thickener for soups, and a cooking-recipe unlock:

• Location: Tide Caverns (mine floors 21-39), all seasons
• Stats: restores 5 Health and 5 Stamina when eaten
• Sell price: 30 Tesserae
• Donatable: Yes — it's part of the Tide Caverns set in the museum's Flora Wing
• Why it matters: donating a Jade Dulse unlocks specific cooking recipes, and it appears in Valen's loved-gift list — she's fond of the Deep Sea Soup family of dishes

Per the wiki.gg Jade Dulse page, Reina even sneaks it into the inn's soup special. It's the seaweed that ties the mines, the museum, and the kitchen together.

Stone Loach — The Upper Mines Camouflage Fish

Stone Loach is a common fish that only spawns in the Upper Mines — the river fish of the mine's first section. It "easily blends in with the surrounding rocks," which is the game's joke about its name:

• Location: The Upper Mines (any floor, fishing)
• Type: Fishing-pole fish, Medium size, Common rarity
• Season/weather: All seasons, any weather
• Sell price: 35 Tesserae
• Donatable: Yes — part of the Upper Mines fish set

Using Common Fish Bait first boosts its spawn rate. Dell (Celine's sister) has a documented fascination with the museum's Stone Loach specimen — "a master of camouflage," per the wiki.gg fish page. It's also a request item, so keep a couple in a chest.

Freshwater Oyster — The River Diving Mollusk

Freshwater Oyster is a common diving mussel found in rivers — you won't catch it with a rod:

• Location: any river; found by Diving (not fishing)
• Season/weather: All seasons, any weather
• Sell price: 25 Tesserae
• Donatable: No — but it's used in requests and quests
• Skill synergy: the Appealing Reeling skills make dive-spots easier to reach, per the wiki.gg oyster page

It's a reliable early quest item: rivers are everywhere, so a quick dive pass on the way to town keeps you stocked for request board fodder.

The Museum's Fish Wing — 22 Sets and the Rare Fish Home

"Fish Wing" isn't an item — it's the museum's fish collection wing, and it's where most rare fish end up. The wiki.gg Fish Wing page lists 22 sets to complete:

• Season sets: Multi-Season, then Spring/Summer/Fall/Winter × River/Pond/Ocean (12 sets)
• Gear sets: Fish Bait Set, Fish Trap Set
• Location sets: Deep Woods, Upper Mines, Tide Caverns, Deep Earth, Lava Caves, Ruins (6 sets)
• The crown jewel: the Legendary Fish Set — the four legendary catches with their weather and quest conditions (see the fishing guide)

Stone Loach feeds the Upper Mines set; the mine-lake legendary completes the chain. Set completion pays equipment and renown — the museum guide has the full reward table.

FAQ

How do I get Refined Stone in Fields of Mistria? Refine it at the Stone Refinery: 10 Stone → 1 Refined Stone in 10 minutes.

Where is the Faceted Rock Gem? Dig Spots in the Deep Earth (mine floors 41-59); with the Stoneturner skill, breaking rocks there can also drop it.

Where does Jade Dulse spawn? The Tide Caverns (floors 21-39), all seasons — it's a forageable, not a fish.

How do I catch a Stone Loach? Fish in the Upper Mines with a fishing pole; Common Fish Bait boosts the spawn rate.

Can I get Freshwater Oyster with a rod? No — it's a diving find in rivers, all seasons.

What is the Fish Wing? The museum's fish collection wing with 22 donation sets, including the Legendary Fish Set.

Related Guides

• Fields of Mistria Mines Guide — Floors, Ores & Magic
• Fields of Mistria Fishing Guide — Every Fish & Legendary
• Fields of Mistria Museum Guide — All Sets & Rewards
• Fields of Mistria Gift Guide — Who Loves Rare Finds
• Fields of Mistria Valen Guide — Jade Dulse & Deep Sea Soup
• Fields of Mistria Festivals Guide — Seasonal Collecting Windows

Official resources: Steam store page · Official site · Wikipedia · wiki.gg Items index