How to flip Necklace of anguish in OSRS

Flipping Necklace of anguish on the Old School RuneScape Grand Exchange currently makes about 83,305 gp profit per item after the 2% GE tax: buy near 15,050,001 gp (the instant-sell price) and re-list near 15,442,148 gp (the instant-buy price).

• Buy at (instant-sell): 15,050,001 gp
• Sell at (instant-buy): 15,442,148 gp
• Margin after 2% tax: 83,305 gp (0.55% ROI)
• Buy limit per 4 hours: 8
• 24h volume: 2,048 (liquid)
• Max profit per limit cycle: 666,440 gp on 120,400,008 gp of capital

The flip, step by step

1. Place a buy offer at or just above 15,050,001 gp (the current instant-sell price).
2. Wait for the fill. Necklace of anguish is liquid right now, so expect fills within the hour at reasonable prices.
3. Re-list at or just below 15,442,148 gp (the current instant-buy price).
4. The GE takes 308,842 gp tax (2%) per item when it sells, leaving 83,305 gp profit each.
5. Repeat up to the buy limit (8 per 4 hours), a full cycle is 666,440 gp on 120,400,008 gp of capital.

Margins move constantly. Re-check the live Necklace of anguish numbers and price chart on GrandExchange.com right before committing.