SI净度的，必须要看暇疵的位置，通常这个级别有Feather羽状裂纹很正常。这个羽裂纹如果在中间问题不大，但如果在周围就要小心了，镶嵌的时候很容易破坏钻石的。。。

以下是对Feather羽裂纹的解释，国外网站上的：

A "feather" is essentially a tiny fracture. We suppose that the labs use the term "feather" as opposed to "crack" because it sounds a whole lot more appealing, but then again they don't call a "cavity" a bubble so who knows... For the sake of consistency, we're going to refer to the term "feather" in our dexxion because that is the standard industry term used to describe small fractures within a diamond.