# Black tourmaline core price > Black tourmaline core Grand Exchange price right now (417,000 gp), with buy and sell prices, 24h volume, our own price history, buy limit, high alch profit and the GE tax. Canonical: https://osrsgrandexchange.com/items/black-tourmaline-core Last updated: 2026-11-02 Members item. Item id 21730. Examine: β€œThe blackened heart of the Grotesque Guardians.” ## Price now Prices as of 2026-11-02 00:20 UTC. **Black tourmaline core has held steady: within 8% of its 30-day average and last week's price.** | | | | --- | --- | | Price | 417,000 gp | | 90-day range (daily averages) | 312,944–687,148 gp | | 30-day average | 396,404 gp | | Change 24h / 7d / 30d | – / -4.4% / -17.0% | | Instant buy | 400,000 gp (2026-10-30 06:33 UTC) | | Instant sell | 434,000 gp (2026-10-30 08:23 UTC) | | Volume 24h | 85 | | 1h average buy / sell | 399,335 / 401,981 gp | | 24h average buy / sell | 321,385 / 304,503 gp | | Buy limit (4h) | 5 | ## Selling - GE tax each: 8,000 gp - You receive: 392,000 gp - Flip margin after tax: -42,000 gp - Per buy limit: -210,000 gp ## High alchemy - High alch value: 24,900 - Low alch value: 16,600 - Profit per cast: -375,252 gp Buying one at the instant-buy price plus a nature rune; fire runes assumed from a staff. ## Black tourmaline core price, last 7 days Hourly averages from our own history. | | Instant-buy average | Instant-sell average | | --- | --- | --- | | Oct 26, 2026 (first point) | 382,102 | 332,436 | | Oct 30, 2026 (last point) | 399,335 | 401,981 | Range plotted: 277,000 to 530,000 gp, over 78 points. ## Black tourmaline core price history Daily averages. Since Apr 8, 2026 the lowest daily sell average was 289,069 gp and the highest buy average 1,823,161 gp. | | Instant-buy average | Instant-sell average | | --- | --- | --- | | Apr 8, 2026 (first point) | 1,535,959 | 1,509,955 | | Oct 31, 2026 (last point) | 321,385 | 304,503 | Range plotted: 289,069 to 1,823,161 gp, over 207 points. ## Questions ### How much is Black tourmaline core worth in OSRS? About 417,000 gp right now on the Grand Exchange: the last instant buy was 400,000 gp and the last instant sell 434,000 gp. Over the last 24 hours 85 were traded. ### What is the GE buy limit for Black tourmaline core? 5 every 4 hours. ### Is Black tourmaline core worth high alching? High alchemy gives 24,900 coins. Buying one at 400,000 gp plus a nature rune makes that a 375,252 gp loss per cast right now. ### How much tax do you pay selling Black tourmaline core? 8,000 gp each at 400,000 gp (2%, rounded down, capped at 5m per item), so you receive 392,000 gp. Item id 21730. Prices update every five minutes. ## Related - [GE tax calculator](https://osrsgrandexchange.com/ge-tax-calculator) - [Best items to alch](https://osrsgrandexchange.com/high-alch) - [How we get prices](https://osrsgrandexchange.com/about)