Glossary
Diamond clarity scale (FL to I3)
Diamonds are assessed under 10× magnification on a fixed scale: FL (flawless), IF (internally flawless), VVS1–VVS2 (very, very slightly included), VS1–VS2 (very slightly), SI1–SI2 (slightly) and I1–I3 (inclusions visible to the eye). The scale applies to colourless and coloured diamonds alike.
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Updated 2026-10-04