| Carat | £/gram | Purity | £/troy oz |
|---|---|---|---|
| 9ct | £39.7553 | 37.5% | £1,236.53 |
| 14ct | £61.8416 | 58.3% | £1,923.49 |
| 18ct | £79.5106 | 75.0% | £2,473.06 |
| 21ct | £92.7624 | 87.5% | £2,885.23 |
| 22ct | £97.1797 | 91.7% | £3,022.63 |
| 24ct | £106.0142 | 100.0% | £3,297.41 |
1 oz = 31.1034768 g24ct £/g = (£/oz ÷ 31.1034768) = £3,297.41 ÷ 31.1034768 = £106.014193£106.014193 × 0.375 = £39.7553£106.014193 × 0.5833… = £61.8416£106.014193 × 0.75 = £79.5106£106.014193 × 0.875 = £92.7624£106.014193 × 0.9166… = £97.1797£106.014193 × 1.000 = £106.0142Scrap £ = grams × (24ct £/g) × (carat ÷ 24)