Golden Jubilee Diamond
| Weight | 545.67 carats (109.134 g) |
|---|---|
| Color | fancy yellow-brown |
| Cut | Fire rose cushion cut |
| Country of origin | South Africa |
| Mine of origin | Premier Mine |
| Discovered | 1985 |
| Cut by | Gabriel Tolkowsky |
| Original owner | Henry Ho |
| Owner | King of Thailand |
The Golden Jubilee Diamond or Phet Kanchanaphisek (Thai: เพชรกาญจนาภิเษก) is a 545.67 carats (109.134 g) brown diamond and was the largest cut and faceted diamond known until the Black Falcon Diamond was revealed with its 612.34 Carat eagle novelty cut. Both outweighs Cullinan I ("Great Star of Africa") by 15.37 carats (3.074 g). The Golden Jubilee Diamond was discovered in 1985 at the Premier Mine (now the Cullinan Diamond Mine), which also produced the Cullinan diamond (1905) and other notable stones such as the Taylor–Burton (1966) and the Centenary (1986).