Black tourmaline core

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Black tourmaline core trades around 445k gp now, +7.7% this week, 7-day range 383k–468k.

Lowlast instant sell

440,000

Highlast instant buy

450,034

Flippers place a buy offer near the low and sell near the high.

Flip margin: +1,034; per item, after 9,000 tax
Flip profit / 4h: 1,034; Buy 1 · spend 440k (10% vol)
Buy limit: 5; per 4 hours
Traded, 24h: 86; both sides
Margin held: —
High alch: 24,900; shop value 41,500

How these numbers work

Sell offer (last insta-buy)450,034

Buy offer (last insta-sell)− 440,000

GE tax, 2% capped at 5m− 9,000

Net margin per item+1,034

Breakeven sell price≥ 448,980

Potential profit, one 4h window

Buy limit5

10% of 4h volume1

10m bankroll ÷ buy22

Quantity (the lowest)× 1

Spend440,000

Potential profit1,034

All materials →Top flips →

About Black tourmaline core on the GE

“The blackened heart of the Grotesque Guardians.”

Black tourmaline core last traded at 450,034 gp (insta-buy) and 440,000 gp (insta-sell) on the Grand Exchange. After the GE tax on a sale, that leaves a margin of 1,034 gp per item. 86 were traded in the last 24 hours. It is a members' item.

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Prices assume you place offers and wait for them to fill. Insta-buying and insta-selling pays the spread twice.
Selling below the breakeven price loses money, even if it is above what you paid.
4h volume is 14 items (4/hr, average over the last 24 hours). Sized to a 10m bankroll; set yours on the home page.

Last 7 days

+7.7% vs 7 days ago

Avg / day: 116
7d low: 383k gp
7d high: 468k gp

Hourly mid price, the average of the buy and sell prices. Volume counts both sides.

Price & volume

When it trades

Times in UTC (game time)

Bar height is trading volumecheapestpriciest

By hour of day

By weekday

987k gp

Hydra tail100k gp

Dragon metal shard1.83m gp

Black tourmaline core price history

All-time high: 8,706,210 gp; 9 Apr 2025
All-time low: 397,045 gp; 6 Oct 2026
30 days: -24.3%
90 days: -60.1%
1 year: -87.7%

Monthly close in gp (last guide price of each month)

2.25mNov 25
2.23mDec 25
2.37mJan 26
1.97mFeb 26
1.61mMar 26
1.47mApr 26
1.43mMay 26
1.17mJun 26
893kJul 26
647kAug 26
474kSept 26
429kOct 26

Daily GE guide prices from 27 Oct 2017 to 11 Oct 2026, from the OSRS Wiki. Data as of 11 Oct 2026.

Tax: Selling one at 450,034 gp costs 9,000 gp in tax (2% of the sale price, rounded down, capped at 5m gp). Tax-exempt items →

Black tourmaline core on the OSRS Wiki ↗

Black tourmaline core FAQ

How much is Black tourmaline core worth?

Black tourmaline core last sold for 440,000 gp (instant sell) and was last bought for 450,034 gp (instant buy) on the Grand Exchange.

What is the Black tourmaline core buy limit?

You can buy 5 Black tourmaline core every 4 hours. The 4 hours start from your first purchase, and only buying counts towards the limit.

Is Black tourmaline core worth high alching?

High alchemy turns Black tourmaline core into 24,900 gp. Buying one at 450,034 gp and casting with a nature rune at 138 gp costs 450,172 gp. That is a loss of 425,272 gp per cast at the latest prices, so it is not worth alching for profit right now.

Is Black tourmaline core tax-exempt?

No. Selling one at 450,034 gp costs 9,000 gp in tax (2% of the sale price, rounded down, capped at 5m gp).

What was Black tourmaline core's highest price?

The highest daily guide price on record for Black tourmaline core is 8,706,210 gp, on 9 Apr 2025. The lowest is 397,045 gp, on 6 Oct 2026.

Related items

About Black tourmaline core on the GE

Last 7 days

Black tourmaline core price history

Black tourmaline core FAQ