A diamond’s clarity grade measures the absence of internal inclusions and external blemishes. Diamonds with higher clarity grades are rarer and more expensive, while stones with lower clarity grades may have visible imperfections. For many buyers, a VS2 or SI1 diamond can provide an eye-clean appearance at a more affordable price.
### What is diamond clarity?
Clarity describes the presence of tiny imperfections within the stone (inclusions) and on the surface (blemishes). Grading labs such as the GIA and IGI use a scale to categorise diamonds based on the size, number and location of these flaws.
### Clarity grades explained
- Flawless (FL) : No inclusions or blemishes visible under 10× magnification.
- Internally Flawless (IF) : No inclusions and only very minor surface blemishes visible at 10×.
- Very, Very Slightly Included (VVS1, VVS2) : Minute inclusions that are extremely difficult to see even at 10× magnification.
- Very Slightly Included (VS1, VS2) : Minor inclusions that are difficult to see under 10× and typically invisible to the naked eye.
- Slightly Included (SI1, SI2) : Noticeable inclusions under 10×; some SI diamonds may appear eye-clean.
- Included (I1, I2, I3) : Obvious inclusions that may affect transparency and brilliance; often visible without magnification.
### How does clarity affect appearance and price?
- Higher clarity grades are rarer, which increases price.
- Inclusions located near the girdle or hidden under prongs are less noticeable.
- Cut and colour often have more impact on brilliance than small inclusions.
- Many SI diamonds appear eye-clean and offer better value.
- Lab-grown diamonds usually have fewer and different types of inclusions because they form in controlled environments.
### Tips for choosing a clarity grade
- Prioritise an eye-clean diamond rather than paying for a grade you can’t see.
- VS2–SI1 grades often provide the best balance of quality and cost.
- Consider lab-grown stones for high clarity at a lower price.
- Always review the diamond’s certificate and view the stone in person or with high-resolution images.
### Frequently asked questions
Are SI diamonds good quality?
Yes – many SI1 and SI2 diamonds are eye-clean, meaning inclusions are invisible to the naked eye, and they offer excellent value.
Does clarity or colour matter more?
For most buyers, cut and colour influence sparkle more than clarity above the eye-clean threshold. Choosing a slightly lower clarity grade can free up budget for a better cut or larger carat.
Do lab-grown diamonds have clarity grades?
Yes – grading labs apply the same scale to lab-grown stones. They often have fewer inclusions because they grow in controlled conditions.
Should I buy a flawless diamond?
Flawless diamonds are extremely rare and command a premium. Unless you want perfection and have the budget, eye-clean VS or SI grades provide similar beauty at a lower price.
_Last updated: March 2026_