| Name: | IRON GEM |
| Type: | Sailing Vessel |
| Launched: | 03/12/1846 |
| Completed: | 1846 |
| Builder: | John Coutts |
| Yard: | Low Walker |
| Yard Number: | |
| Dimensions: | (1871: 349grt, 112.7 x 27.5 x 17.4ft); (by 1878: 337grt) |
| Engines: | None |
| Engines by: | n/a |
| Propulsion: | Sail, rigged as a Barque |
| Construction: | Wood |
| Reg Number: | 5574 |
| History: | |
| 1846 | Unknown owner |
| by 1867 | George Austen, London |
| by 1871 | Rose & Co, London |
| by 1878 | P Leroux, Bordeaux; renamed ALPHONSE ET MARIE |
| No later history known | |
| Comments: | 1851: Lengthened |