The Jonker
| Weight | 726 carats (145.2 g) |
|---|---|
| Color | D-flawless |
| Country of origin | South Africa |
| Mine of origin | Elandsfontein |
| Discovered | 17 January 1934 |
| Cut by | Lazare Kaplan |
| Original owner | Ernest Oppenheimer |
| Owner | Anonymous |
| Estimated value | $2.25M+ |
The Jonker diamond was found at the Elandsfontein mine in South Africa by Johannes Jacobus Jonker on 17 January 1934. The diamond was 726 carats, which at the time was the fourth largest uncut gem ever found.