| Carat | £/gram | Purity | £/troy oz |
|---|---|---|---|
| 9ct | £39.7239 | 37.5% | £1,235.55 |
| 14ct | £61.7927 | 58.3% | £1,921.97 |
| 18ct | £79.4477 | 75.0% | £2,471.10 |
| 21ct | £92.6890 | 87.5% | £2,882.95 |
| 22ct | £97.1028 | 91.7% | £3,020.23 |
| 24ct | £105.9303 | 100.0% | £3,294.80 |
1 oz = 31.1034768 g24ct £/g = (£/oz ÷ 31.1034768) = £3,294.80 ÷ 31.1034768 = £105.930280£105.930280 × 0.375 = £39.7239£105.930280 × 0.5833… = £61.7927£105.930280 × 0.75 = £79.4477£105.930280 × 0.875 = £92.6890£105.930280 × 0.9166… = £97.1028£105.930280 × 1.000 = £105.9303Scrap £ = grams × (24ct £/g) × (carat ÷ 24)