| Carat | £/gram | Purity | £/troy oz |
|---|---|---|---|
| 9ct | £39.6893 | 37.5% | £1,234.47 |
| 14ct | £61.7388 | 58.3% | £1,920.29 |
| 18ct | £79.3785 | 75.0% | £2,468.95 |
| 21ct | £92.6083 | 87.5% | £2,880.44 |
| 22ct | £97.0182 | 91.7% | £3,017.60 |
| 24ct | £105.8380 | 100.0% | £3,291.93 |
1 oz = 31.1034768 g24ct £/g = (£/oz ÷ 31.1034768) = £3,291.93 ÷ 31.1034768 = £105.838007£105.838007 × 0.375 = £39.6893£105.838007 × 0.5833… = £61.7388£105.838007 × 0.75 = £79.3785£105.838007 × 0.875 = £92.6083£105.838007 × 0.9166… = £97.0182£105.838007 × 1.000 = £105.8380Scrap £ = grams × (24ct £/g) × (carat ÷ 24)