Rubium splinters

Rubium splinters
Released							20 May 2026 (Update)
Members							Yes
Quest item							No
Properties
Tradeable							Yes
Equipable							No
Stackable							Yes
Noteable							No
Options							Drop
Examine							Be careful with these! They're unstable!
Values
Value							15 coins
High alch							9 coins
Low alch							6 coins
Weight							0.02 kg
Grand Exchange
Exchange							132 coins (info)
Buy limit							30,000
Daily volume							429,254
View real-time prices
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Advanced data
Item ID							31722
Link							MOID

Rubium splinters are resources that are mined from rubium rocks at level 48 Mining, found in the Charred Dungeon on Charred Island. Each rock will provide a guaranteed two splinters, and may deplete randomly on each subsequent splinter mined.

About and uses

At level 68, rubium deposits can also be mined for rubium geodes which can be broken down with a hammer and chisel into splinters. The amount of splinters obtained from a geode scales with Mining level.^[1]

10 splinters and 2 of any smithable cannonball can be used at an anvil to smith 2 incendiary cannonballs every 3 ticks in batches of 56 (up to 28 actions per batch). This is done by left-clicking "Smith" on the anvil; using either the splinters or the cannonball on the anvil will not work.

When fired from a ship's cannon, the incendiaries have a chance to burn their targets.

• Rubium ore also exists in RuneScape 3 with key differences:
  • Instead of veins found deep in the Witchaven Dungeon, rubium splinters are found via rubium rocks in the Charred Dungeon.
  • The completion of the quest Kennith's Concerns in RuneScape 3 is required to mine Rubium, while the rocks containing Rubium splinters in Old School RuneScape only require 60 Sailing to dock at its respective island.
  • Unlike rubium in RuneScape 3, the splinters are stackable and are not destroyed when dropped.
• Using Rubium Splinters on an anvil will incorrectly yield the message "You need to purify the ore first, by smelting it in a furnace" even though they cannot be smelted.

v t e Sailing resources
Mining	Items Lead ore Nickel ore Rubium Rubium geode Lead bar Cupronickel bar Dragon metal sheet Dragon nails Chain Scenery Lead rocks Nickel rocks Rubium rocks
Woodcutting	Logs Jatoba logs Camphor logs Ironwood logs Rosewood logs Trees Jatoba tree Camphor tree Ironwood tree Rosewood tree
Crafting	Cotton boll Hemp Hemp yarn Cotton yarn Linen yarn
Construction	Bolt of linen Bolt of canvas Bolt of cotton Camphor plank Ironwood plank Rosewood plank
Farming	Seeds Flax Hemp Cotton Camphor Ironwood Rosewood Elkhorn Pillar Umbral Saplings Camphor Ironwood Rosewood Plants Flax Hemp Cotton Camphor tree Ironwood tree Rosewood tree Elkhorn coral Pillar coral Umbral coral Corals Elkhorn Pillar Umbral
Fishing	Raw giant krill Giant krill Raw haddock Haddock Raw yellowfin Yellowfin Raw halibut Halibut Raw bluefin Bluefin Raw marlin Marlin Raw swordtip squid Swordtip squid Raw jumbo squid Jumbo squid Squid paste Squid beak
Hunter	Raw red crab meat Red crab meat Raw blue crab meat Blue crab meat Raw rainbow crab meat Rainbow crab meat Crab paste Rainbow crab paste
Other	Gryphon feather