The Ultimate Guide to Diamond Cut Quality
Team Edited
8/23/2025
Record Growth
"Exceptional Brilliance and Cut Quality"
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Jennifer K.
,2025
"The vintage-inspired design is exactly what I wanted. The attention to detail in the setting complements the diamond perfectly. A true work of art."
When it comes to diamond quality, cut is arguably the most important factor affecting a diamond’s beauty and brilliance. Unlike the other 4 Cs (color, clarity, and carat), cut quality is entirely determined by human skill and craftsmanship.
Understanding Diamond Cut Basics
Diamond cut refers to how well a diamond’s facets interact with light. A well-cut diamond will exhibit exceptional brilliance, fire, and scintillation – the three optical effects that make diamonds so captivating.
The Science Behind the Sparkle
When light enters a well-cut diamond, it bounces from facet to facet before returning to your eye. This creates the brilliance we associate with quality diamonds. Poor cut quality allows light to leak out the sides and bottom, resulting in a dull appearance.
Key Cut Quality Factors:
- Proportions: The relationship between the diamond’s depth, table size, and crown angles
- Symmetry: How precisely the facets align with each other
- Polish: The smoothness of the diamond’s surface
Grading Cut Quality
The GIA grades diamond cut quality on a scale from Excellent to Poor. For maximum brilliance and value, we recommend focusing on Excellent and Very Good grades.
Expert Tips for Cut Selection
When evaluating cut quality, trust your eyes as much as the certificate. A diamond with excellent cut grades should display exceptional brilliance and fire even in moderate lighting conditions.
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