Black tourmaline core
The blackened heart of the Grotesque Guardians.
Black tourmaline core is a members-only item on the OSRS Grand Exchange. Recent trades put the high price at 318,788 GP (1h ago) and the low price at 303,003 GP (42m ago). Buying at the low price and selling at the high price would leave 9,410 GP per item after the 2% tax (3.11% of the buy price). You can buy up to 5 every four hours. High Alchemy would lose 278,267 GP per cast if you bought it at the low price and paid for the nature rune. 82 were traded in the last 24 hours.
| High | 318,788 GP () |
|---|---|
| Low | 303,003 GP () |
| Tax | 6,375 GP |
| Margin | 9,410 GP |
| ROI | 3.11% |
| Buy limit | 5 every 4 hours |
| High alchemy | 24,900 GP |
Buy price (insta-sell / low): 303,003 GP
Sell price (insta-buy / high): 318,788 GP
Margin after tax: 9,410 GP per unit. Grand Exchange tax on a sale is 6,375 GP.
Buy limit: 5 every 4 hours.
The full buy limit of 5 Black tourmaline core costs 1,515,015 GP at the current buy price. Across that quantity, the after-tax margin is 47,050 GP.
- Grand Exchange buy limit: 5 every 4 hours
- Members-only item
- High alchemy value: 24,900 GP
- Low alchemy value: 16,600 GP
- Base value: 41,500 GP
Black tourmaline core price history
- Over the past 7 days, the average high ranged from 311,094 GP to 333,671 GP across 14 hourly samples. From 2026-11-02 UTC to 2026-11-08 UTC, it moved from 311,094 GP to 316,988 GP (+5,894 GP, +1.89%).
- Over the past 30 days, the average high ranged from 270,296 GP to 541,468 GP across 48 hourly samples. From 2026-10-10 UTC to 2026-11-08 UTC, it moved from 447,000 GP to 316,988 GP (-130,012 GP, -29.09%).
- Over the past 90 days, the average high ranged from 270,296 GP to 700,000 GP across 119 hourly samples. From 2026-08-11 UTC to 2026-11-08 UTC, it moved from 658,654 GP to 316,988 GP (-341,666 GP, -51.87%).
- Over the past 90 days, the highest average high was 700,000 GP on 2026-08-13 UTC, and the lowest was 270,296 GP on 2026-10-25 UTC.
As of 2026-11-08 UTC. See this week's market summary.
To cite this page: QuantScapers, "Black tourmaline core price history", based on OSRS Wiki real-time price data through 2026-11-08 UTC. Calculations by QuantScapers.
What is the Grand Exchange buy limit for Black tourmaline core?
You can buy up to 5 Black tourmaline core every 4 hours on the Grand Exchange.
Is Black tourmaline core a members-only item?
Black tourmaline core is a members-only item and requires OSRS membership to trade.
What is Black tourmaline core's current buy and sell price?
At the latest update, Black tourmaline core's insta-sell (low) price is 303,003 GP and its insta-buy (high) price is 318,788 GP on the Grand Exchange.
How much Grand Exchange tax applies to Black tourmaline core?
A sale of Black tourmaline core pays the standard 2% Grand Exchange tax, which is 6,375 GP per unit at the current price.
What does a full buy limit of Black tourmaline core cost?
Buying the full limit of 5 Black tourmaline core costs 1,515,015 GP at the current insta-sell price of 303,003 GP each.