4.00 ct Square Cushion Laboratory-Grown Diamond

What reads well

• A 1.02:1 length-to-width ratio sits in the classic cushion range.
• Face-up spread (9.15 × 8.94 mm) is typical or better for a 4.00 ct cushion.
• Excellent polish and symmetry, the top finish grades.
• D color is in the colorless range.
• IF clarity: inclusions are not a practical visual factor.

What deserves a closer look

• The depth 71.1% sits outside the typical cushion range.
• Slightly thick to very thick girdle: a thick girdle carries hidden weight and can reduce face-up size (thicker points are common in fancy shapes).
• Screening only: for this cushion, check images or video of the exact stone for the facet pattern (bold, chunky flashes or finer "crushed ice") and any dark areas under the table.

The reading, field by field

Table · Ideal

At 58%, the table sits within the typical 56–66% range for a cushion, balancing brightness with fire.

Total depth · Closer look

71.1% is deeper than typical for a cushion (61–69%). Extra depth holds weight below the girdle, so the stone can face up smaller than its carat weight suggests.

Length-to-width · Ideal

A 1.02:1 outline is within the classic 1–1.35:1 range for a cushion.

Polish · Ideal

Excellent polish is the top finish grade — facets are cleanly executed with nothing that would soften sparkle.

Symmetry · Ideal

Excellent symmetry is the top finish grade — facets are cleanly executed with nothing that would soften sparkle.

Girdle · Closer look

Slightly thick to very thick (faceted): a thick girdle carries weight in the rim, so the stone can face up a little smaller for its carat weight. It is durable, though.

Culet · Ideal

Pointed: no visible culet facet when viewed face-up.

Color · Ideal

D is in the colorless range and faces up white in any metal.

Clarity · Ideal

Internally Flawless (IF): inclusions, if any, are only visible under magnification.

Fluorescence · Ideal

None: no meaningful effect on appearance.

What to check on the exact stone

• With 71.1% depth, does this stone face up smaller than a typical 4.00 ct square cushion?
• Does this cushion produce broad, chunky flashes or small needle-like crushed-ice sparkle?
• Is extra carat weight trapped in the thick girdle rim where it does not add finger presence?
• Can you show me the inscribed report number under a loupe before it is set?

Report facts

Origin

Laboratory-grown

Carat

4.00 ct

Shape

Square Cushion

Cut grade

Not given for this shape

Color

D

Clarity

IF

Measurements

9.15 × 8.94 × 6.36 mm

Table

58%

Total depth

71.1%

Crown angle

Not given for this shape

Pavilion angle

Not given for this shape

Polish

Excellent

Symmetry

Excellent

Girdle

Slightly thick to very thick (faceted)

Culet

Pointed

Fluorescence

None