Diamonds are a type of gemstone and one of the most valuable substances on Earth. In Panem, diamonds are associated with District 1, whose primary industry is the manufacture of luxury items (such as jewelry). This makes District 1 very wealthy and creates a favorable relationship between them and the Capitol, whose members are always hungry for the finer things in life. According to Katniss, there is a machine in District 1 that can turn graphite into diamonds. However, this machine may be somewhat useless at the time the series takes place; District 13 used to mine graphite, but since it was obliterated in the rebellion, graphite may no longer common as a raw material.
For the Tribute Parade of the 74th Hunger Games, the tributes from District 1 (Glimmer and Marvel), were dressed in "tasteful tunics" decorated will jewels. Diamonds may have been among those decorations.
Diamonds were used to decorate one Katniss' potential wedding dresses in Catching Fire. They were also used on tribute's chariots during the opening ceremonies. The dark blue velvet dress Katniss wore to her tour in District 2 was studded with diamonds, and was jealously described by Johanna Mason in Catching Fire.
In The Hunger Games, Effie Trinket, the District 12 escort, mistakenly says that putting pressure on coal turns it into pearls. Katniss speculates on whether she meant diamonds, but notes that's untrue as well. Putting pressure and heat on coal rarely results in diamonds; however, this takes millennia and it is unlikely Katniss would know this. In Catching Fire, Peeta quotes Effie Trinket after he finds a pearl while diving for oysters.
- ↑ The Hunger Games, Chapter 6