What is a Princess Cut Diamond?

The princess cut is a square or rectangular diamond with pointed corners and brilliant-style faceting. Developed in the 1960s, it's the second most popular diamond shape after round brilliant.

Princess cut characteristics:

  • Square shape: Modern, geometric appearance with sharp 90-degree corners
  • Brilliant faceting: Similar light performance to round but in square format
  • 58-76 facets: Varies by cutter but uses brilliant facet arrangement
  • Pointed corners: Require protective prong settings to prevent chipping

Princess cuts appeal to buyers seeking modern aesthetics and value-conscious shoppers who want brilliance at lower prices than round.

What is a Round Brilliant Diamond?

The round brilliant is the most popular and scientifically optimized diamond shape, accounting for approximately 75% of all diamonds sold.

Round brilliant characteristics:

  • Circular shape: Classic, timeless appearance that suits all ring styles
  • 57 or 58 facets: Standardized facet arrangement optimized for light return
  • Maximum brilliance: Mathematically optimized to return maximum light
  • GIA cut grading: Only shape with official cut quality grades

Round brilliants are the default choice for buyers seeking maximum sparkle, traditional aesthetics, and highest resale value.

Price Comparison: Princess vs Round

Princess cuts cost 20-30% less than round diamonds of equivalent carat, color, and clarity.

Why Princess Costs Less

The price difference stems from cutting economics:

  • Higher yield from rough: Princess cuts retain more weight from rough crystal (60-80% vs. 40-50% for rounds)
  • Less material waste: Square shape cuts efficiently from octahedral rough diamond crystal
  • Lower demand: Princess cuts are less popular, creating lower market prices
  • No cut grading premium: GIA doesn't grade princess cut quality, reducing quality premiums

Price Example

1.0 carat Round, G color, VS2, Excellent cut = $7,000

1.0 carat Princess, G color, VS2, Excellent proportions = $5,000

The princess cut saves $2,000 (29%) with similar visual impact and quality.

Brilliance and Light Performance

Round brilliants produce maximum brilliance due to centuries of optical optimization. Princess cuts offer excellent brilliance but slightly less than ideal rounds.

Round Brilliant Advantages

  • Mathematically optimized proportions for maximum light return
  • Standardized cutting ensures consistent brilliance
  • GIA cut grade verifies light performance quality
  • More brilliance from all viewing angles

Princess Cut Performance

  • Excellent brilliance but varies more between cutters
  • No standardized cut grade requires proportion analysis
  • Square shape creates different sparkle pattern than round
  • Well-cut princess can rival round in brilliance

Both shapes can be brilliant when well-cut, but rounds have less variation in quality due to standardization.

Durability and Practical Considerations

Princess Cut Vulnerabilities

The pointed corners of princess cuts are the most vulnerable part of any diamond shape. These 90-degree points concentrate stress and chip easily if struck.

Required: Four-prong setting with V-prongs protecting each corner, or bezel setting

Round Brilliant Durability

Rounds have no pointed corners or sharp edges, making them the most durable diamond shape for everyday wear.

Advantage: Can be set in any setting style without durability concerns

Long-Term Wear

For engagement rings worn daily for decades, round brilliants present fewer durability risks. Princess cuts require more careful wear and protective settings.

Apparent Size: Princess vs Round

Princess cuts appear smaller than rounds of equal carat weight due to weight distribution:

Face-Up Size Comparison

A 1.0 carat princess cut measures approximately 5.5mm x 5.5mm (30.25mm²)

A 1.0 carat round brilliant measures approximately 6.5mm diameter (33.18mm²)

The round appears about 10% larger in face-up area despite identical carat weight.

Why This Happens

Princess cuts carry more weight in the pavilion (bottom) due to pointed corners extending downward. This weight isn't visible when the diamond is set.

Rounds distribute weight more evenly between crown and pavilion, maximizing visible face-up size.

Which Shape is Right for You?

Choose princess cut if:

  • You prefer modern, geometric aesthetics
  • Budget is a primary concern (20-30% savings)
  • You like square shapes and clean lines
  • You're willing to use protective settings

Choose round brilliant if:

  • You want maximum brilliance and sparkle
  • You prefer classic, timeless aesthetics
  • Resale value is important (rounds hold value better)
  • You want the most durable shape for daily wear
  • You want GIA cut grading for quality assurance

Princess vs Round: Final Recommendations

  • Best value: Princess cut offers 20-30% savings with excellent brilliance
  • Maximum brilliance: Round brilliant optimized for light return
  • Durability: Round wins for long-term wear and fewer setting constraints
  • Size appearance: Round appears 10% larger at equal carat weight
  • Resale value: Round holds value better due to higher demand
  • Aesthetic: Princess for modern, round for timeless

Both shapes offer beauty when well-cut. Princess appeals to value-conscious buyers seeking modern style. Round suits those prioritizing maximum brilliance, durability, and resale value.