| Name: | IRON GEM |
| Type: | Sailing Vessel |
| Launched: | 03/12/1846 |
| Completed: | 1846 |
| Builder: | John Coutts |
| Yard: | Low Walker |
| Yard Number: | |
| Dimensions: | (by 1866: 355grt, 112.7 x 27.5 x 17.4ft); (by 1878: 337grt) |
| Engines: | None |
| Engines by: | n/a |
| Propulsion: | Sail, rigged as a Barque |
| Construction: | Iron |
| Reg Number: | 5574 |
| History: | |
| 1847 | J Smith, Sunderland; registered at Sunderland |
| 05/04/1847 | Thompson & Co, Hull; registered at Hull |
| 1862 | Barter & Co, London; registered at London |
| 1865 | George Austen & Co, London |
| 1871 | Rose & Co, London |
| 1875 | P Leroux, Bordeaux; renamed ALPHONSE ET MARIE |
| No later history known | |
| Comments: | 1851: Lengthened |