The small rough crystals of blue Sapphire are about 0.8 - 1.2cm in size.
Per VE (=packing unit) with 50g you get approx. 50 - 60 rough sapphire stones.
Strengthening of mental power and perspicacity are the classical topics, where blue Sapphires are used aufgund their effect. The mineral can lead to an unshakable inner peace.