What Is a Gemstone Inclusion?
The tiny internal marks inside a stone — what they are and when they matter.
When jewelers talk about clarity, they are really talking about inclusions. These tiny internal features are completely normal — understanding them helps you judge a stone with confidence rather than worry.
A simple definition
An inclusion is any small internal characteristic within a gemstone — a tiny crystal, a feather-like line, or a small cloud. They form as the stone grows and act like a natural fingerprint, making each stone unique.
When do inclusions matter?
What most buyers care about is whether a stone is “eye-clean” — meaning no inclusions are visible without magnification. If you cannot see them at arm's length, they have no effect on the stone's beauty. They mainly matter under a loupe or for grading purposes.
Inclusions in moissanite
Quality moissanite is typically grown to be very clean, so visible inclusions are rare. That is one reason its sparkle stays consistent. To see how clarity fits with the other quality factors, read The 4 Cs of Gemstone Quality.
Should you avoid all inclusions?
Not necessarily. Chasing a flawless grade can cost far more for a difference no one can see. An eye-clean stone gives you beauty and value at the same time — a smarter way to spend.
FAQs
Are inclusions a flaw?
Not really — they are natural internal features. As long as a stone is eye-clean, inclusions don't affect its everyday beauty.
Does moissanite have inclusions?
Quality moissanite is grown to be very clean, so visible inclusions are uncommon.
Clean, Brilliant Stones
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