IGI report LG786628580

1.45 ct Round Brilliant Laboratory-Grown Diamond

81/100 · Considered

A balanced profile with a few questions to carry forward.

What reads well

Crown 31.6° / pavilion 40.2° fall outside the pairing zone associated with strong light return.

Table · Closer look: A 60% table is larger than typical for a round brilliant (53–59%). Large tables can read bright but flatter, with less fire and contrast.
Total depth · Closer look: 59.1% is shallower than typical for a round brilliant (59.5–63%). That spreads the stone face-up but raises the risk of windowing — a glassy, see-through center.
Crown angle · Favorable: A 31.6° crown is shallower than the typical 32–36° zone, which tends to trade some fire for brightness.
Pavilion angle · Closer look: 40.2° is shallower than the narrow 40.5–41.3° zone. Shallow pavilions can let light pass straight through, looking glassy.
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 To Slightly Thick (Faceted): 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 · Ideal: VVS1: inclusions, if any, are only visible under magnification.
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.

Does a gray ring or glassy patch show around the center when you look straight down?
With a shallow 59.1% depth, can you see a glassy, see-through patch in the center?
Does the large table look bright but flat, with less colored fire than you expected?
Can you show me the inscribed report number under a loupe before it is set?