How to flip Ancient crystal in OSRS

Flipping Ancient crystal on the Old School RuneScape Grand Exchange currently makes about 3,213 gp profit per item after the 2% GE tax: buy near 148,550 gp (the instant-sell price) and re-list near 154,860 gp (the instant-buy price).

• Buy at (instant-sell): 148,550 gp
• Sell at (instant-buy): 154,860 gp
• Margin after 2% tax: 3,213 gp (2.16% ROI)
• Buy limit per 4 hours: 250
• 24h volume: 1,077 (liquid)
• Max profit per limit cycle: 803,250 gp on 37,137,500 gp of capital

The flip, step by step

1. Place a buy offer at or just above 148,550 gp (the current instant-sell price).
2. Wait for the fill. Ancient crystal is liquid right now, so expect fills within the hour at reasonable prices.
3. Re-list at or just below 154,860 gp (the current instant-buy price).
4. The GE takes 3,097 gp tax (2%) per item when it sells, leaving 3,213 gp profit each.
5. Repeat up to the buy limit (250 per 4 hours), a full cycle is 803,250 gp on 37,137,500 gp of capital.

Margins move constantly. Re-check the live Ancient crystal numbers and price chart on GrandExchange.com right before committing.