IGI report LG776648016
1.57 ct Princess Laboratory-Grown Diamond
90/100 · Refined
A strong candidate on paper; confirm its light pattern in imagery.
What reads well
- Face-up spread (6.62 × 6.26 mm) is typical or better for a 1.57 ct princess.
- Table 67% and depth 71.7% fall in the typical princess range.
- Excellent polish and symmetry, the top finish grades.
- E color is in the colorless range.
- VS1 clarity is typically eye-clean in a princess.
What deserves a closer look
- A 1.06:1 length-to-width ratio is outside the classic princess range; the outline will look more elongated than typical.
- 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 · Ideal
- At 67%, the table sits within the typical 63–74% range for a princess, balancing brightness with fire.
- Total depth · Ideal
- 71.7% 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 · Favorable
- A 1.06:1 outline is longer and slimmer than the classic 1–1.05:1 range for a princess — a matter of taste, but worth seeing in person.
- 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
- Will all four sharp corners be seated safely in V-prongs to prevent corner fractures?
- 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
- 1.57 ct
- Shape
- Princess
- Cut grade
- Not given for this shape
- Color
- E
- Clarity
- VS1
- Measurements
- 6.62 × 6.26 × 4.49 mm
- Table
- 67%
- Total depth
- 71.7%
- Crown angle
- Not given for this shape
- Pavilion angle
- Not given for this shape
- Polish
- Excellent
- Symmetry
- Excellent
- Girdle
- Medium
- Culet
- Pointed
- Fluorescence
- None