| Weight | 5,899.5 carats (1,179.8 g) |
|---|---|
| Color | White with blue cast |
| Cut | Oval (brilliant)[1] |
| Country of origin | Brazil |
| Cut by | Walter Kean[2] |
| Original owner | Mrs. Thuy Ngo Nguyen |
| Current owner | Field Museum of Natural History, Grainger Hall of Gems |
| Estimated value | Unassessed [3] |
The Chalmer's Topaz is a topaz gem weighting 5,899.5-carats located in Chicago, Illinois' Grainger Hall of Gems, in the Field Museum of Natural History. It was named for former Field Museum trustee William J. Chalmers and is one of the largest cut topaz gems in the world.[4]