| Carat | £/gram | Purity | £/troy oz |
|---|---|---|---|
| 9ct | £39.4453 | 37.5% | £1,226.89 |
| 14ct | £61.3594 | 58.3% | £1,908.49 |
| 18ct | £78.8907 | 75.0% | £2,453.78 |
| 21ct | £92.0391 | 87.5% | £2,862.74 |
| 22ct | £96.4220 | 91.7% | £2,999.06 |
| 24ct | £105.1876 | 100.0% | £3,271.70 |
1 oz = 31.1034768 g24ct £/g = (£/oz ÷ 31.1034768) = £3,271.70 ÷ 31.1034768 = £105.187598£105.187598 × 0.375 = £39.4453£105.187598 × 0.5833… = £61.3594£105.187598 × 0.75 = £78.8907£105.187598 × 0.875 = £92.0391£105.187598 × 0.9166… = £96.4220£105.187598 × 1.000 = £105.1876Scrap £ = grams × (24ct £/g) × (carat ÷ 24)