The Carat Standard

IGI report LG783666865

1.50 ct Radiant Laboratory-Grown Diamond

89/100 · Refined

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

What reads well

  • Face-up spread (8.41 × 5.47 mm) is typical or better for a 1.50 ct radiant.
  • Table 68% and depth 66.7% fall in the typical radiant range.
  • D color is in the colorless range.
  • VS1 clarity is typically eye-clean in a radiant.
  • No fluorescence: no haze risk to weigh.

What deserves a closer look

  • A 1.54:1 length-to-width ratio is outside the classic radiant range; the outline will look more elongated than typical.
  • 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 68%, the table sits within the typical 60–70% range for a radiant, balancing brightness with fire.
Total depth · Ideal
66.7% is within the typical 61–68% range for a radiant, keeping weight where it contributes to face-up size and light return.
Length-to-width · Favorable
A 1.54:1 outline is longer and slimmer than the classic 1.2–1.5:1 range for a radiant — a matter of taste, but worth seeing in person.
Polish · Favorable
Very Good polish is a fine result; the difference from Excellent is rarely visible without magnification.
Symmetry · Favorable
Very Good symmetry is a fine result; the difference from Excellent is rarely visible without magnification.
Girdle · Ideal
Slightly Thick To Thick: a durable girdle thickness that doesn't hide meaningful weight.
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 · Favorable
VS1 is typically eye-clean.
Fluorescence · Ideal
None: no meaningful effect on appearance.

What to check on the exact stone

  • Does this CVD diamond show any brown or gray undertone face-up in daylight?
  • With Very Good polish and Very Good symmetry, are there visible misaligned facets or wheel marks?
  • Can you show me the inscribed report number under a loupe before it is set?

Report facts

Origin
Laboratory-grown
Carat
1.50 ct
Shape
Radiant
Color
D
Clarity
VS1
Cut
Not stated
Measurements
8.41 × 5.47 × 3.65 mm
Table
68%
Depth
66.7%
Crown angle
Not stated
Pavilion angle
Not stated
Girdle
Slightly thick to thick
Culet
Pointed
Polish
Very Good
Symmetry
Very Good
Fluorescence
None

About The Carat Standard Score

How The Carat Standard reads a report