Diamond Polish & Symmetry Guide
Diamond polish and symmetry are important finishing details that influence how refined a diamond looks. While the 4Cs are the main grading factors, polish and symmetry help explain the quality of the diamond’s craftsmanship.
At Pear Jewels Australia, we specialise in premium Lab-Grown diamond jewellery crafted for modern Australian buyers, with IGI certification included whenever applicable.
What Is Diamond Polish?
Diamond polish refers to the smoothness of a diamond’s surface after cutting. A well-polished diamond allows light to pass cleanly through the facets.
Poor polish may create tiny surface marks that can reduce the crispness of the diamond’s appearance.
| Grade | Meaning | Recommendation |
|---|---|---|
| Excellent | Very precise finish | Premium choice |
| Very Good | High-quality finish | Excellent value |
| Good | Acceptable finish | Review with cut quality |
| Fair | Noticeable limitations | Not preferred |
| Poor | Weak finish | Avoid for premium jewellery |
What Is Diamond Symmetry?
Diamond symmetry refers to how precisely the facets, angles and proportions align. Good symmetry helps the diamond reflect light evenly.
Symmetry is especially important in shapes where alignment is easy to see, such as round, emerald, oval and princess cut diamonds.
Polish and Symmetry Grades
Polish and symmetry are usually graded as Excellent, Very Good, Good, Fair or Poor. These grades appear on many diamond certificates, including IGI reports.
For premium Lab-Grown diamond jewellery, Excellent or Very Good polish and symmetry are generally preferred.
Do Polish and Symmetry Affect Sparkle?
Yes, but they work together with cut quality. A diamond with strong cut proportions, good polish and good symmetry will usually show better light performance.
Cut remains the most important factor for sparkle, but polish and symmetry help complete the diamond’s overall finish.
What Should You Choose?
For engagement rings, Pear Jewels generally recommends selecting diamonds with Excellent or Very Good polish and symmetry whenever possible.
This helps ensure the finished jewellery looks refined, bright and premium.
Frequently Asked Questions
What is diamond polish?
Polish refers to how smooth and refined the diamond’s surface is after cutting.
What is diamond symmetry?
Symmetry refers to how well the diamond’s facets and proportions align.
Are polish and symmetry part of the 4Cs?
No. They are additional grading details that support overall diamond quality.
What polish and symmetry grade should I choose?
Excellent or Very Good is recommended for premium engagement rings and fine jewellery.
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