Black tourmaline core icon — OSRS Grand Exchange

Black tourmaline core

“The blackened heart of the Grotesque Guardians.” — in-game examine

MembersBuy limit: 5View on OSRS Wiki ↗
Current Price
508,000 gp
Live price
Market
Buy Price
508,000 gp
Sell Price
497,000 gp
Margin
11.0K gp
Tax
-10.2K gp
ROI
+0.17%
24h Volume
94
Buy Limit
5
Alchemy
High Alch
24,900 gp
High Alch Profit
-472.4K gp
Low Alch
16,600 gp
Low Alch Profit
-480.6K gp
Shop Value
41,500 gp
508,000 gp-63.4%in period
Chart image
Black tourmaline core Old School RuneScape Grand Exchange price history. Current buy price: 508,000 gp.478.5K932.9K1.39MBuy (high)Sell (low)2026-06-122026-09-07

About Black tourmaline core

The black tourmaline core is a dark, hardened heart dropped by the Grotesque Guardians on the Slayer Tower rooftop. It is used to upgrade Bandos boots into guardian boots, a process that consumes the core and cannot be reversed. According to the tome The Living Statues, the Bandosian general Snaarldor used it to animate the tower's statues, though the gargoyles later rebelled. This members-only item is worth 41,500 coins.

Black tourmaline core Daily Price History

DateAvg BuyAvg SellVolume
2026-09-07495,517480,40194
2026-09-06497,764478,480103
2026-09-05492,244483,92796
2026-09-04508,244512,48098
2026-09-03548,264538,08474
2026-09-02559,847547,16087
2026-09-01567,412552,46193
2026-08-31546,791523,057100
2026-08-30568,466532,835113
2026-08-29578,378564,342100
2026-08-28581,387565,09080
2026-08-27556,357557,17867
2026-08-26576,192558,94878
2026-08-25570,678551,53568
2026-08-24579,504570,05681
2026-08-23604,129582,331128
2026-08-22619,615600,667102
2026-08-21617,814592,437101
2026-08-20622,122588,65470
2026-08-19635,544619,30879
2026-08-18653,990632,188107
2026-08-17641,062623,688100
2026-08-16619,919618,157131
2026-08-15643,159628,57695
2026-08-14653,217623,243128
2026-08-13645,625649,507117
2026-08-12646,195637,981103
2026-08-11650,267636,847115
2026-08-10664,693656,826115
2026-08-09672,765658,161144

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