Diamond Polish and Symmetry: The Fourth C That Matters
Most buyers focus on cut, color and clarity, but polish and symmetry also affect sparkle. Learn what these grades mean.
What Are Polish and Symmetry?
Polish measures how smooth the diamond facets are after cutting. Symmetry measures how evenly the facets align. Both are graded from Poor to Excellent. View our rings.
What Grades Should You Choose?
| Grade | Visible Effect | Buy? |
|---|---|---|
| Excellent | Ideal sparkle | Yes, preferred |
| Very Good | Virtually indistinguishable | Good value |
| Good | Slight light leakage | Avoid for center stone |
| Fair/Poor | Noticeable dullness | Do not buy |
How They Affect Price
Upgrading from Very Good to Excellent in polish/symmetry usually costs only 3-5% more but is visible. When buying lab-grown diamonds, always ask for Excellent polish and symmetry — our cutters optimize both. Ask about our diamonds.
Ready to Find Your Perfect Piece?
Factory-direct pricing from our Panyu, Guangzhou workshop. Our team will reply within 24 hours with pricing and availability.
Get a Free Quote Chat on WhatsAppFrequently Asked Questions
Do polish and symmetry affect diamond value?
Yes. Excellent polish and symmetry command a premium of 3-10% over Good grades.
Can you tell the difference between Excellent and Very Good?
To the naked eye, almost never. Under a loupe, Very Good may show tiny facet misalignments.
Are lab-grown diamonds better cut?
Yes. Modern lab growth and cutting technology consistently produces Excellent cut, polish and symmetry.