The Carat Standard

IGI report LG778660340

2.58 ct Cushion Laboratory-Grown Diamond

87/100 · Refined

A strong candidate on paper; confirm its light pattern in imagery.

What reads well

  • A 1.35:1 length-to-width ratio sits in the classic cushion range.
  • Face-up spread (9.73 × 7.23 mm) is typical or better for a 2.58 ct cushion.
  • Excellent polish and symmetry, the top finish grades.
  • F color is in the colorless range.
  • VS1 clarity is typically eye-clean in a cushion.

What deserves a closer look

  • 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.
  • Treatment status is not stated on the report. For a laboratory-grown diamond, ask whether it is as-grown or post-growth treated.

The reading, field by field

Table · Ideal
At 59%, the table sits within the typical 56–66% range for a cushion, balancing brightness with fire.
Total depth · Closer look
60% is shallower than typical for a cushion (61–69%). That spreads the stone face-up but raises the risk of windowing — a glassy, see-through center.
Length-to-width · Ideal
A 1.35:1 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 · Ideal
Medium to slightly thick (faceted): a durable girdle thickness that doesn't hide meaningful weight.
Culet · Ideal
Long Faceted: a keel-line culet, normal for elongated step and modified cuts.
Color · Ideal
F is in the colorless range and faces up white in any metal.
Clarity · Favorable
VS1 is typically eye-clean.
Fluorescence · Ideal
None: no meaningful effect on appearance.

What to check on the exact stone

  • With a shallow 60% depth, can you see a glassy, see-through patch in the center?
  • Does this cushion produce broad, chunky flashes or small needle-like crushed-ice sparkle?
  • Does this CVD diamond show any brown or gray undertone face-up in daylight?
  • Can you show me the inscribed report number under a loupe before it is set?

Report facts

Origin
Laboratory-grown
Carat
2.58 ct
Shape
Cushion
Cut grade
Not given for this shape
Color
F
Clarity
VS1
Measurements
9.73 × 7.23 × 4.34 mm
Table
59%
Total depth
60%
Crown angle
Not given for this shape
Pavilion angle
Not given for this shape
Polish
Excellent
Symmetry
Excellent
Girdle
Medium to slightly thick (faceted)
Culet
Long Faceted
Fluorescence
None

About The Carat Standard Score

How The Carat Standard reads a report