Most of your gems are graded with letters like VVS and VS. But some are not. Why is that?
The clarity grades of IF, VVS, VS, SI and I1 apply to transparent gemstones, where the interior of the stone is visible. If a gem is translucent or opaque, you can't see inclusions. So these gems are simply graded as translucent or opaque. You will typically see this grading for cabochons and even for some faceted gems such as fire opal or black tourmaline.
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