A Spirit Amber is a special jewel given to Letter Bees, granting them special powers. It is said that insects (such as bees and wasps) with spiritual powers were trapped in an amber coating, thus giving the amber itself their powers.

However, this amber is not exclusive for the Letter Bees, as there are many illegal miners who black-market the jewel, which is very expensive. A reason why Letter Bees are usually in danger because of this is because their Spirit Ambers are very rare, unlike mined ambers.

Many times we have learnt that the ambers are very important, and more so with Lag Seeing's Spirit Amber eye (which can reveal the memories of persons/objects).