The blackened heart of the Grotesque Guardians.
558.3k gp
Updated 7m ago
Black tourmaline core is currently trading at 558.3k gp on the Grand Exchange and is down 17.9% over the last 24 hours. Current instant-buy and instant-sell prices are 501.6k gp and 615.0k gp.
Category: ores · Members only · View on OSRS Wiki
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Black Tourmaline Core is a members-only item on the OSRS Grand Exchange in the ores category.
In-game examine text: "The blackened heart of the Grotesque Guardians."
It has a Grand Exchange buy limit of 5 every four hours, a high alchemy value of 24.9k gp, and item ID 21730.
Margin: 101.1k gp per flip
Volume: 454 trades / 24h
Buy limit: 5 every 4 hours
Max profit/cycle: 505.7k gp
Verdict: High margin with healthy liquidity
Black Tourmaline Core shows an active flip setup with a margin of +101.1k gp and 454 trades over the last 24 hours.
At the buy limit of 5 every four hours, max profit per cycle is about 505.7k gp — high margin with healthy liquidity.
| Time | Buy avg | Buy vol | Sell avg | Sell vol | Margin |
|---|---|---|---|---|---|
| 10m ago(8/7/2026) | 501.6k | 2 | — | – | – |
| 20m ago(8/7/2026) | 613.0k | 2 | 615.0k | 1 | 2.0k |
| 30m ago(8/7/2026) | — | – | 615.0k | 2 | – |
| 35m ago(8/7/2026) | — |
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| – |
| 615.0k |
| 2 |
| – |
| 45m ago(8/7/2026) | 611.0k | 1 | — | – | – |
| 55m ago(8/7/2026) | — | – | 600.5k | 4 | – |
| 1h ago(8/7/2026) | 600.0k | 1 | — | – | – |
| 1h ago(8/7/2026) | — | – | 623.6k | 2 | – |
| 2h ago(8/7/2026) | 601.3k | 3 | — | – | – |
| 2h ago(8/7/2026) | 608.0k | 3 | — | – | – |
| 2h ago(8/7/2026) | 605.0k | 5 | — | – | – |
| 3h ago(8/7/2026) | 606.0k | 2 | — | – | – |
2.5k gp