Shatterpoint
this term was used to describe the locations at which even the hardest material could be struck, resulting in its breaking into pieces. Most commonly associated with Corusca gems, shatterpoints are notoriously difficult to locate, and the judgement of how much force to exert on a shatterpoint is an art only a few beings ever learn. Too little force applied to a shatterpoint results in a degradation of the crystalline matrix, which caused the gem to fall apart later. Too much force, and the entire gem shatters instantly. A precisely-gauged blow resulted in the shearing of the gem along a certain plane, resulting in a beautiful facet.