Black tourmaline core

item #21730 · buy limit 5 · 16 days of history backtested

Latest price: 367,699 gp instant-buy · 295,000 gp instant-sell
Last 24 h average: 362,160 gp high · 324,058 gp low · 91 traded

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Buy limit5

TypeMembers

Notenot in the current top scan — backtest below still applies

Price chart

drag to pan · scroll to zoom · hover for values

Candles use the GE's average instant-buy (wick top) & instant-sell (wick bottom) per period; bodies show period-to-period mid-price moves — the GE publishes no true open/close. buy bandsell band

Backtest — profit/day per unit by band

Each cell replays this item's history with that buy/sell percentile pair, no lookahead (bands from past data only). ★ = best. Hover a cell for flips & hold time.

buy↓ sell→	75%	80%	85%	90%	93%	97%
5%	36.5k	32.0k	33.4k	33.7k	34.7k	19.4k
8%	35.0k	30.5k	32.0k	32.3k	33.3k	18.0k
12%	31.4k	26.8k	28.3k	28.6k	29.6k	18.0k
16%	30.8k	26.3k	27.8k	28.0k	29.1k	17.6k
20%	42.5k	38.0k	39.5k	39.7k	40.8k	29.3k
25%	51.4k★	46.9k	48.4k	48.6k	49.7k	38.2k

Optimal buy 25% / sell 75% → 11 flips, 51.4k/day per unit (~16.2h hold) vs Default 12% / 93% → 7 flips, 29.6k/day (+74%)

Bands are a starting point, not a promise — the fill model is simplified and popular flips crowd (your buy gets bid up, your sell pushed down). How this works →

Unofficial fan project — not affiliated with or endorsed by Jagex. Data from the OSRS Wiki real-time prices API. A game, not financial advice; nothing here is automated and you shouldn't automate it (it's against Jagex's rules).

For information only - not financial advice. In-game Grand Exchange prices fluctuate and flips can lose value; trade at your own risk.