[Source] Gemstones, also known as gems, were a type of mineral crystal found in the galaxy. Gems were considered to be extremely valuable, such as the fire rubies on Lothal, an Outer Rim planet. Another type of gem was the Corusca gem, a purple-hued gem used as a form of currency. Some artworks contained gemstones, and they were sold at black markets or other vendors such as Otor's Hub.