![The diamond will be sold with a 19th-century plaque, above, that belonged to the Parma royal family](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/E7LHXK5NQZDMAYTKYBB3NUDKG4.jpg?smart=true&auth=c039c8cce9d5cd950aa5ed2a91ce2cdb518a3945fcb10f21f1483fff76955be3&width=400&height=225)
The diamond will be sold with a 19th-century plaque, above, that belonged to the Parma royal family
The diamond will be sold with a 19th-century plaque, above, that belonged to the Parma royal family
Rare Golconda diamond up for auction for the first time in its 300-year history
We tell the gem’s remarkable story