Raw materials

Ruby

Al₂O₃. Hard, conductive gemstone composed of aluminum oxide.

Depth 180–1242 m

How to get

Where to find

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Found loose in: Lost River ≈389 · 582–925 m Grand Reef ≈227 · 216–500 m Blood Kelp Zone ≈216 · 207–592 m Dunes ≈145 · 217–410 m Bulb Zone ≈119 · 209–560 m Sea Treader Path ≈72 · 248–318 m Inactive Lava Zone ≈47 · 1092–1242 m Crash Zone ≈37 · 180–340 m Sparse Reef ≈35 · 250–293 m Underwater Islands ≈32 · 215–362 m Mountains ≈24 · 285–371 m Crag Field ≈4 · 192–273 m

Used in (5)

Aerogel

Cyclops depth module MK1

Power cell charger

Prawn suit depth module MK1

Seamoth depth module MK3

Databank

Ruby

A hard, blood-red gemstone, made of aluminum oxide. Rubies may be processed in order to leverage their structural integrity in advanced vehicle construction and modification.

Assessment: Essential for advanced fabrication

Subnautica data: build 83031 (Oct 2025)