和树木不同的是，当你以平行梨晶长端的视线角度观察时，将看不到任何生长线。
Unlike a tree, if one looks parallel to the length of the boule, no lines will be seen.
树木呈现同心圆的年轮线，而在天然刚玉晶体中这些生长线是角状的，它们都会有一个形成的中心点。
In trees, these lines are concentric, while in natural crystals, they are angular, but both form from a central point.
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