The Carat Standard

IGI report LG780643487

1.23 ct Princess Laboratory-Grown Diamond

89/100 · Refined

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

What reads well

  • A 1.03:1 length-to-width ratio sits in the classic princess range.
  • Face-up spread (5.96 × 5.76 mm) is typical or better for a 1.23 ct princess.
  • F color is in the colorless range.
  • VS2 clarity is typically eye-clean in a princess.
  • No fluorescence: no haze risk to weigh.

What deserves a closer look

  • The table 76% sits outside the typical princess range.
  • Screening only: for this princess, check images or video of the exact stone for dark areas across the corners or a see-through centre.
  • 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 · Closer look
A 76% table is larger than typical for a princess (63–74%). Large tables can read bright but flatter, with less fire and contrast.
Total depth · Ideal
70.5% is within the typical 64–75% range for a princess, keeping weight where it contributes to face-up size and light return.
Length-to-width · Ideal
A 1.03:1 outline is within the classic 1–1.05:1 range for a princess.
Polish · Ideal
Excellent polish is the top finish grade — facets are cleanly executed with nothing that would soften sparkle.
Symmetry · Favorable
Very Good symmetry is a fine result; the difference from Excellent is rarely visible without magnification.
Girdle · Ideal
Slightly thick: a durable girdle thickness that doesn't hide meaningful weight.
Culet · Ideal
Pointed: no visible culet facet when viewed face-up.
Color · Ideal
F is in the colorless range and faces up white in any metal.
Clarity · Favorable
VS2 is typically eye-clean.
Fluorescence · Ideal
None: no meaningful effect on appearance.

What to check on the exact stone

  • Does the large table look bright but flat, with less colored fire than you expected?
  • Is this VS2 diamond eye-clean face-up from about 10 inches away?
  • Will all four sharp corners be seated safely in V-prongs to prevent corner fractures?
  • Can you show me the inscribed report number under a loupe before it is set?

Report facts

Origin
Laboratory-grown
Carat
1.23 ct
Shape
Princess
Cut grade
Not given for this shape
Color
F
Clarity
VS2
Measurements
5.96 × 5.76 × 4.06 mm
Table
76%
Total depth
70.5%
Crown angle
Not given for this shape
Pavilion angle
Not given for this shape
Polish
Excellent
Symmetry
Very Good
Girdle
Slightly thick
Culet
Pointed
Fluorescence
None

About The Carat Standard Score

How The Carat Standard reads a report