A gem that shines like a star, fetches a good price.
A Sapphire can be acquired via quarrying large rocks or Crystal deposit. It can also be grown from a Crystella Tree, or received by reaching the 2nd position in Workshop Ranking at the end of a month.
Large Fish Tank
6 Strengthened Glass
5 Steel Plate
4 Bronze Pipe
Data taken from game assets, game version 7.0100427. Listed values are without The Giver skill, which gives an extra 1-2 points.
All other characters will default to Neutral (+1).