This article is about Ruby in Subnautica. To see this subject's article on the Below Zero Wiki, click here.

Ruby is a raw material commonly found throughout the Grand Reef, Lost River, and the Sea Treader's Tunnel Caves. According to its description, it is used for advanced vehicle construction and modification.


Rubies appear as white rocks with four short, red mineral spikes jutting outward, giving them a generally realistic appearance. They have a small glow at night which makes them much easier to find.

Uses in Crafting


Gel SackRubyArrow-right (1)FabricatorArrow-right (1)Aerogel

Cyclops Fabricator

Plasteel IngotRubyRubyRubyArrow-right (1)Cyclops Upgrade ConsoleArrow-right (1)Cyclops Depth Module MK1

Habitat Builder

Advanced Wiring KitRubyRubyTitaniumTitaniumArrow-right (1)Habitat BuilderArrow-right (1)Power Cell Charger

Modification Station

Seamoth Depth Module MK2Plasteel IngotRubyRubyRubyArrow-right (1)Modification StationArrow-right (1)Seamoth Depth Module MK3

Data Bank Entry

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



  • The former name for Ruby was Aluminum Oxide Crystal.
    • Ruby is a form of aluminum oxide, which the Ruby shares its original name with. This is also mentioned in the item's description, as a chemical formula.
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