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Cushion|Lab Grown|IGI

1.58ct F SI1 Cushion Lab Grown Diamond

VG • F/SI1 • IGI LG663415348

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG663415348

Diamond specifications and retailer prices

From $1,880 USD
As of November 2, 2026
1 retailer carries this diamond
Only listing: $1,880 USD at Brilliant Earth
Only one retailer lists this diamond right now, and it is shown above, so there is nothing to unlock. Similar diamonds are carried by several retailers.
View at Brilliant Earth

About this 1.58ct lab-grown cushion diamond

This 1.58ct lab-grown cushion sits in the one-and-a-half to two carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a very-good cut grade and certified by IGI LG663415348 or 663415348. Listed at a single retailer as of November 2, 2026. If it later appears at another store, Carat Hunter will surface the price comparison automatically. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.58
Carat
F
Color
SI1
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle40.8°
Pavilion angle35.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG663415348
Dimensions6.82 × 6.23 × 4.41 mm
L/W Ratio1.09
Girdle conditionFaceted
Cert comments
Pre-existing laser inscription on girdle. As Grown - No indication of post-growth treatment.. This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process.
Top View
6.82 mm6.23 mm1.58 ctF / SI1
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateIGI LG663415348
Side View
Table 60.0%Crown 40.8°Girdle: STK-THKPavilion 35.4°Culet: NoneDepth 70.8%

Caratlytics Score

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C
Average
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Price History

Last verified: Nov 2
Current: $1,880 USD|Low: $518 USD|High: $1,880 USD|Avg: $1,033 USD
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
March 23, 2026
Retailer 3$518 USD
Retailer 2$743 USD
Retailer 4$918 USD
Brilliant Earth$1,880 USD

34 data points across 4 retailers

1 retailer

C
Brilliant Earth
12484857Y · Nov 2
$1,880 USD
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C
1.58ct Cushion
$1,880 USD