The Carat Standard

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

About The Carat Standard Score

How The Carat Standard reads a report