Mana Breath
"Even if they are just deep blue crystals, they are still very expensive. If you fail the following procedure, the gemstone will be destroyed and you will receive another one. There are only three crystals for each one of you.
"Destroying them all will mark the end of the lesson, the need to attend this subject as well as of any chance of becoming a Crystalsmith."
"Since you have come so far, you will still get a passing grade, but no Master Crystalsmith will take an apprentice incapable of handling a blue crystal after three months of practice." Professor Farg explained.
"What you have to do is the same thing you have already done countless times, but with one major difference. When you use the Crystalsmith spell Scope on the gemstone, you'll notice there are no lines inside.