The Carat Standard

IGI report LG789613629

2.66 ct Emerald Laboratory-Grown Diamond

93/100 · Signature

An unusually disciplined report profile.

What reads well

  • A 1.45:1 length-to-width ratio sits in the classic emerald cut range.
  • Face-up spread (9.59 × 6.61 mm) is typical or better for a 2.66 ct emerald cut.
  • Table 64% and depth 66.1% fall in the typical emerald cut range.
  • Excellent polish and symmetry, the top finish grades.
  • D color is in the colorless range.

What deserves a closer look

  • 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.

The reading, field by field

Table · Ideal
At 64%, the table sits within the typical 60–69% range for an emerald cut, balancing brightness with fire.
Total depth · Ideal
66.1% 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 1.45:1 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
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 open step facets, is the center completely eye-clean without any visible dark marks?
  • Does this HPHT-grown diamond look neutral white beside another stone in daylight, with no gray or blue cast?
  • Can you show me the inscribed report number under a loupe before it is set?

Report facts

Origin
Laboratory-grown
Carat
2.66 ct
Shape
Emerald
Color
D
Clarity
VVS1
Cut
Excellent
Measurements
9.59 × 6.61 × 4.37 mm
Table
64%
Depth
66.1%
Crown angle
Not stated
Pavilion angle
Not stated
Girdle
Medium
Culet
Long
Polish
Excellent
Symmetry
Excellent
Fluorescence
None

About The Carat Standard Score

How The Carat Standard reads a report