What the grades mean
FL and IF are rare. VVS and VS grades usually carry clean appearance. SI can be good value if the inclusion is not visible to the naked eye and not in a risky position.
Why position matters
A small inclusion under a prong is different from a dark crystal in the table. A feather near the girdle can carry different risk from a pinpoint off to the side.
Selling clarity
When selling, clarity is not negotiated from memory. A certificate, plotted diagram, inscription, and physical inspection protect both seller and buyer.
Decision table
Use the details, not a shortcut.
| Grade band | Plain-English read | Buyer note |
|---|---|---|
| FL/IF | No visible inclusions under grading conditions | Rare, premium priced |
| VVS1/VVS2 | Very difficult to see at 10x | High quality, often overkill for budget buyers |
| VS1/VS2 | Minor inclusions at 10x | Strong value band for many natural diamonds |
| SI1/SI2 | Noticeable at 10x, sometimes eye-visible | Inspect stone, not only grade |
| I1-I3 | Eye-visible inclusions | Price and durability need careful review |
Direct answers
Common questions
What does eye-clean mean?
It means inclusions are not obvious to the unaided eye in normal viewing. The term is practical, not a formal lab grade.
Is SI clarity always bad?
No. Some SI stones are attractive and fairly priced. Others have obvious or risky inclusions. Inspection matters.
Can Prodiam value a diamond without a certificate?
Prodiam can inspect stones, but a recognised grading report usually makes pricing and resale discussions cleaner.