A Food found on Terra: https://www.furaffinity.net/view/55569266/

Jamstone or Gemstone Jam is a Special Berry Jam made with Berries found on the Few yet Many Floating Isles of Terra fittingly called Gemerries' or Gemstone Berries

The Berries themselves have a Harden Shell-Transparent Shell with a Soft Core that overtime will become a Seed for newer Trees. Its said the Main Reasons for its High Price is because of not only Gathering of the Berries but its also cause it fills in almost all General Nutrient Groups as well. Based on the Trees Wood Color it will make that color of Gemerries, its also a Special Request to have Solo Color or Pure Color Jamstone like Sapphire Jamstone or Ruby Jamstone

Image was based on a Anime Food idea, I think it was called Delicious in Dungeon*