IGI report LG781631000

4.17 ct Emerald Laboratory-Grown Diamond

90/100 · Refined

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

What reads well

A 1.47:1 length-to-width ratio sits in the classic emerald cut range.
Face-up spread (11.11 × 7.55 mm) is typical or better for a 4.17 ct emerald cut.
Table 64% and depth 67% fall in the typical emerald cut range.
Excellent polish and symmetry, the top finish grades.
F color is in the colorless range.

Screening only: for this emerald cut, check images or video of the exact stone for the "hall of mirrors" step pattern, any see-through window under the table and clean corners.
Treatment status is not stated on the report. For a laboratory-grown diamond, ask whether it is as-grown or post-growth treated.

Table · Ideal: At 64%, the table sits within the typical 60–69% range for an emerald cut, balancing brightness with fire.
Total depth · Ideal: 67% is within the typical 60–69% range for an emerald cut, keeping weight where it contributes to face-up size and light return.
Length-to-width · Ideal: A 1.47:1 outline is within the classic 1.3–1.5:1 range for an emerald cut.
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: Long: a keel-line culet, normal for elongated step and modified cuts.
Color · Ideal: F is in the colorless range and faces up white in any metal.
Clarity · Favorable: VS1 is typically eye-clean, though step cuts show inclusions more readily — worth a close look at the images.
Fluorescence · Ideal: None: no meaningful effect on appearance.
Cut grade · Ideal: Excellent as issued by IGI, on IGI's own scale. The measured proportions above tell you more than the label.

With open step facets, is the center completely eye-clean without any visible dark marks?
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?