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Cabbage rune
Semi-precious blue gem was removed after an update.
As the contents of this page no longer exist in Old School RuneScape, this article is preserved for historical purposes.
Semi-precious blue gem detail

A semi-precious blue gem is an item obtained during the 2018 Birthday event by using a rod with net on the fishing spot directly south of the White Knights' Castle. It is to be given to Herquin so that he can create a polished blue gem.