The Carat Standard

IGI report LG784637048

1.55 ct Radiant Laboratory-Grown Diamond

85/100 · Refined

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

What reads well

  • A 1.44:1 length-to-width ratio sits in the classic radiant range.
  • Face-up spread (8.23 × 5.72 mm) is typical or better for a 1.55 ct radiant.
  • Excellent polish and symmetry, the top finish grades.
  • E color is in the colorless range.
  • VS1 clarity is typically eye-clean in a radiant.

What deserves a closer look

  • The depth 70.6% sits outside the typical radiant range.
  • 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 61%, the table sits within the typical 60–70% range for a radiant, balancing brightness with fire.
Total depth · Closer look
70.6% 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 1.44:1 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 · Favorable
VS1 is typically eye-clean.
Fluorescence · Ideal
None: no meaningful effect on appearance.

What to check on the exact stone

  • With 70.6% depth, does this stone face up smaller than a typical 1.55 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
1.55 ct
Shape
Radiant
Color
E
Clarity
VS1
Cut
Not stated
Measurements
8.23 × 5.72 × 4.04 mm
Table
61%
Depth
70.6%
Crown angle
Not stated
Pavilion angle
Not stated
Girdle
Medium
Culet
Pointed
Polish
Excellent
Symmetry
Excellent
Fluorescence
None

About The Carat Standard Score

How The Carat Standard reads a report