The Carat Standard

IGI report LG785607353

2.58 ct Round Brilliant Laboratory-Grown Diamond

89/100 · Refined

A strong, composed candidate on paper.

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.
  • VS1 clarity is typically eye-clean in a round brilliant.
  • No fluorescence: no haze risk to weigh.

What deserves a closer look

  • Crown 35.1° / pavilion 41.4° fall outside the pairing zone associated with strong light return.
  • 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 59%, the table sits within the typical 53–59% range for a round brilliant, balancing brightness with fire.
Total depth · Ideal
62.7% is within the typical 59.5–63% range for a round brilliant, keeping weight where it contributes to face-up size and light return.
Crown angle · Ideal
35.1° sits in the 32–36° zone where crown angles typically balance fire and brightness.
Pavilion angle · Closer look
41.4° is steeper than the narrow 40.5–41.3° zone. Deep pavilions can leak light through the sides and darken the center.
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 · Favorable
VS1 is typically eye-clean.
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

  • Does the center turn dark or lose sparkle when you tilt the diamond face-up?
  • 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
2.58 ct
Shape
Round Brilliant
Color
D
Clarity
VS1
Cut
Excellent
Measurements
8.68–8.74 × 5.47 mm
Table
59%
Depth
62.7%
Crown angle
35.1°
Pavilion angle
41.4°
Girdle
Medium to slightly thick (faceted)
Culet
Pointed
Polish
Excellent
Symmetry
Excellent
Fluorescence
None

About The Carat Standard Score

How The Carat Standard reads a report