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- I1
- Included.
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- I2
- Included
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- I3
- Included
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- IF
- Internally Flawless
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- Included Crystal
- A mineral crystal contained within a diamond.
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- Inclusion
- Internal imperfection of the diamond.
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- Internal Graining
- Irregular crystal growth within the diamond. May appear milky or colored, like faint lines or streaks.
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- Irradiated Diamond
- A diamond which has been exposed to radiation.
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