How to check if a diamond is eye-clean — the exact process I use at jewelers and online.

"Eye-clean" is one of the most used and least explained terms in diamond buying. Here is exactly how I evaluate it.

Definition:
Eye-clean means no inclusions are visible to the naked eye from a normal viewing distance (approximately 10–12 inches / 25–30cm) in face-up position under typical lighting.

In-person at a jeweler:

1. Hold the diamond face-up at arm's length (about 10 inches from your eye)
2. Look at it in the lighting conditions of the store (not just the intense spotlights — also try near a window)
3. Look for dark spots, white clouds, or scratches visible without a loupe
4. If you can't see anything without effort, it's eye-clean
5. Then ask for a loupe to see what's there — this is the GIA report made visible

Online buying (James Allen / Blue Nile):

1. Use their 360° video viewer and zoom in to maximum
2. Switch between face-up and edge views
3. Look for inclusions visible at maximum digital zoom
4. Read the GIA clarity plot to see WHERE inclusions are located
5. Center-top is most visible; near girdle or pavilion are least

Clarity grades that are usually eye-clean:

• FL, IF, VVS1, VVS2: always eye-clean (you're paying for lab cleanliness you can't see)
• VS1, VS2: almost always eye-clean
• SI1: often eye-clean, but varies — MUST verify
• SI2: sometimes eye-clean, needs careful evaluation
• I1 and below: usually visible to naked eye

The sweet spot for value: SI1 or VS2 that you've verified as eye-clean. You skip the premium for invisible perfection.