DeYoung Red Diamond
| DeYoung Red Diamond | |
| Weight | 5.03 carats (1.006 g) | 
|---|---|
| Color | Deep red with slight brown tint | 
| Cut | Modified round brilliant | 
| Owner | Smithsonian Institution | 
| Estimated value | USD$5 million or lower | 
38°53′27.2″N 77°01′32.2″W / 38.890889°N 77.025611°W The DeYoung Red Diamond is a 5.03-carat unmounted rare red diamond. It is the third-largest red diamond in the world, and the only one on public display. Sydney DeYoung (for whom the diamond is named) obtained the diamond, which was mistaken for a garnet, at a flea market. The diamond was given to the Smithsonian Institution after DeYoung's death in 1986.