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A picture of diamond polishing (Polish)

Diamond 4C Diamond Polished Polish

Polishing is the key process to determine the smoothness of a diamond's surface, which directly affects the final luster and brilliance of the diamond.

1. What is polishing?

Polishing refers to the surface of the diamondOverall smoothness and flatness. In the final stage of cutting, the artisan polishes the surface of the diamond with special tools to eliminate tiny abrasions and imperfections, allowing light to penetrate and reflect smoothly.

Excellent

The surface is extremely smooth and the light is perfectly refracted and brilliant.

Poor polish

Tiny scratches on the surface, blocking the light and dulling the luster.

2. GIA polishing grade

GIA categorizes polishing quality into five grades. A high quality polish allows the diamond to reflect light better, revealing more brilliance and sparkle.

Excellent (EX) Extremely smooth surface, unobstructed light flow
Very Good (VG) Very small features, visible under magnification.
Good (G) Some minor features that do not affect the overall appearance
Fair (F) Visible features affecting luster
Poor (P) Obvious surface defects that significantly reduce aesthetics

3. Summary of Purchase Highlights

Surface vs Interior

Polish meansfaceSmoothness; Clarity meansInternalFlaws.

Check GIA Certificate

The grade is clearly indicated in the "Polish" section of the certificate.

Locked EX or VG

This is the best choice to ensure the brilliance and value of your diamond.

Match with Symmetry

Ideally, the finish and symmetry should be EX grade.

Diamond Polishing Knowledge Sheet

GIA Certificate｜DIAMOND 4C Weight｜DIAMOND 4C color｜DIAMOND 4C Clarity｜DIAMOND 4C Turning｜DIAMOND 4C Polishing｜DIAMOND 4C Symmetry｜Diamond Fluorescence｜Diamond H&A