The Carat Standard

IGI report LG782679374

3.09 ct Radiant Laboratory-Grown Diamond

89/100 · Refined

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

What reads well

  • A 1.41:1 length-to-width ratio sits in the classic radiant range.
  • Face-up spread (10.10 × 7.18 mm) is typical or better for a 3.09 ct radiant.
  • Excellent polish and symmetry, the top finish grades.
  • E color is in the colorless range.
  • VVS2 clarity: inclusions are not a practical visual factor.

What deserves a closer look

  • Screening only: for this radiant, check images or video of the exact stone for the sparkle pattern (defined flashes or "crushed ice") and any dark or see-through corners.
  • 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 60%, the table sits within the typical 60–70% range for a radiant, balancing brightness with fire.
Total depth · Closer look
68.8% is deeper than typical for a radiant (61–68%). Extra depth holds weight below the girdle, so the stone can face up smaller than its carat weight suggests.
Length-to-width · Ideal
A 1.41:1 outline is within the classic 1.2–1.5:1 range for a radiant.
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: a durable girdle thickness that doesn't hide meaningful weight.
Culet · Ideal
Pointed: no visible culet facet when viewed face-up.
Color · Ideal
E is in the colorless range and faces up white in any metal.
Clarity · Ideal
VVS2: inclusions, if any, are only visible under magnification.
Fluorescence · Ideal
None: no meaningful effect on appearance.

What to check on the exact stone

  • With 68.8% depth, does this stone face up smaller than a typical 3.09 ct radiant?
  • 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
3.09 ct
Shape
Radiant
Cut grade
Not given for this shape
Color
E
Clarity
VVS2
Measurements
10.10 × 7.18 × 4.94 mm
Table
60%
Total depth
68.8%
Crown angle
Not given for this shape
Pavilion angle
Not given for this shape
Polish
Excellent
Symmetry
Excellent
Girdle
Medium
Culet
Pointed
Fluorescence
None

About The Carat Standard Score

How The Carat Standard reads a report