The Clarity Scale, Quickly
| Grade | What It Means |
|---|---|
| FL / IF | Flawless / Internally Flawless — no inclusions visible under 10x magnification (IF may show minor surface blemishes only) |
| VVS1 / VVS2 | Very, Very Slightly Included — inclusions so minor they're very difficult for a trained grader to see under 10x |
| VS1 / VS2 | Very Slightly Included — minor inclusions, ranging from difficult to somewhat easy to see under magnification |
| SI1 / SI2 | Slightly Included — noticeable to a trained grader under magnification, and sometimes visible to the naked eye |
| I1–I3 | Included — inclusions obvious under magnification and sometimes visible without it, which can affect brilliance in more pronounced cases |
Clarity grading also weighs the position, size, nature, and relief of an inclusion, not just whether it's technically visible — which is why two stones with the same clarity grade can still look noticeably different from each other in person.
The Color Scale, Quickly
GIA's color scale runs from D to Z, grouped into five tiers: D–F is Colorless, the rarest and whitest; G–J is Near Colorless and, for most people's eyes, indistinguishable from colorless once set — especially in white metal — making it the most popular value zone; K–M is Faint, with a light tint noticeable on close inspection; N–R is Very Light; and S–Z is Light, visibly tinted, which some buyers choose deliberately for a warm, vintage look.
Why "Eye-Clean" Depends on the Cut, Not Just the Grade
This isn't an official GIA standard, but it's a principle widely corroborated across the jewelry trade: step cuts like emerald and asscher have large, open, flat facets and a big table that act almost like a window straight into the stone — both inclusions and color show up more readily here. Asscher's proportions and more symmetrical facet pattern hide inclusions very slightly better than a classic emerald cut, though both remain far more revealing than a brilliant cut. For step cuts specifically, VS1 or better is the commonly cited safe zone if you're buying without seeing the stone in person — a well-chosen VS2 can still be eye-clean, but it's a bigger gamble without viewing photos or video of the actual stone first.
Brilliant cuts — round, cushion, radiant, and princess — break light into many small facets that scatter reflections and camouflage smaller inclusions. A well-cut cushion or round can look completely eye-clean at VS1 or even VS2, because the faceting hides what a step cut would expose. This is where real value hides: paying for a clarity grade above SI1 rarely buys anything visible in these shapes.
Marquise, pear, and heart shapes are the exception within brilliant cuts — inclusions and color can sometimes concentrate visibly right at the point or center cleft. Those points are also structurally more vulnerable to chipping, so it's worth asking us to check that specific spot on the certificate before choosing a stone, for durability as well as appearance. (Note that a shadow across the center of these shapes is usually a separate cut-quality phenomenon called the "bow-tie effect," not a clarity issue — worth knowing the difference when you're evaluating a specific stone.)
Practical Combos We Recommend
- Emerald or Asscher: VS1 or better clarity, G color or better — especially in white gold or platinum.
- Round, Cushion, Princess, Radiant: VS1–VS2 clarity is usually eye-clean; G–H color is the value sweet spot.
- Oval, Pear, Marquise, Heart: VS1 clarity with the point specifically checked; G–H color.
- Warm metal settings (yellow or rose gold): you can often drop to I–J color, since the metal's warmth visually blends with it rather than reading as yellow the way it might in platinum.