IGI report LG766644301
1.30 ct Round Brilliant Laboratory-Grown Diamond
92/100 · Signature
An unusually disciplined report profile.
What reads well
- The IGI Excellent cut grade corroborates the measured proportions.
- Excellent polish and symmetry, the top finish grades.
- D color is in the colorless range.
- VVS1 clarity: inclusions are not a practical visual factor.
- No fluorescence: no haze risk to weigh.
What deserves a closer look
- Crown 35.9° / pavilion 41.1° fall outside the pairing zone associated with strong light return.
The reading, field by field
- Table · Ideal
- At 57%, the table sits within the typical 53–59% range for a round brilliant, balancing brightness with fire.
- Total depth · Closer look
- 63.1% is deeper than typical for a round brilliant (59.5–63%). Extra depth holds weight below the girdle, so the stone can face up smaller than its carat weight suggests.
- Crown angle · Ideal
- 35.9° sits in the 32–36° zone where crown angles typically balance fire and brightness.
- Pavilion angle · Ideal
- 41.1° is inside the narrow 40.5–41.3° zone where the pavilion returns light most efficiently.
- 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.
What to check on the exact stone
- With 63.1% depth, does this stone face up smaller than a typical 1.30 ct round?
- Does this HPHT-grown diamond look neutral white beside another stone in daylight, with no gray or blue cast?
- Can I see this stone in soft daylight away from store spotlights to verify its sparkle?
- Can you show me the inscribed report number under a loupe before it is set?
Report facts
- Origin
- Laboratory-grown
- Carat
- 1.30 ct
- Shape
- Round Brilliant
- Cut grade
- Excellent (IGI)
- Color
- D
- Clarity
- VVS1
- Measurements
- 6.89–6.94 × 4.36 mm
- Table
- 57%
- Total depth
- 63.1%
- Crown angle
- 35.9°
- Pavilion angle
- 41.1°
- Polish
- Excellent
- Symmetry
- Excellent
- Girdle
- Medium to slightly thick (faceted)
- Culet
- Pointed
- Fluorescence
- None