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Cushion|Lab Grown|IGI

1.31ct E SI1 Cushion Lab Grown Diamond

EX • E/SI1 • IGI LG694550465

Shape and cutting style on the report: Square cushion modified brilliant

Certificate IGI LG694550465

Diamond specifications and retailer prices

From $208 USD
As of November 6, 2026
Save $882 USD (81%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: $1,090 USD at Brilliant Earth · As of November 6, 2026
View at Brilliant Earth

About this 1.31ct lab-grown cushion diamond

This 1.31ct lab-grown cushion sits in the one-and-a-quarter to one-and-a-half carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG694550465 or 694550465. Listed at 13 retailers as of November 6, 2026, with prices from $208 to $1,090, a $882 spread on the same certified stone. Brilliant Earth lists it at $1,090. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.31
Carat
E
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle38.9°
Pavilion angle38.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG694550465
Dimensions6.44 × 6.23 × 4.20 mm
L/W Ratio1.03
Girdle conditionFaceted
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
6.44 mm6.23 mm1.31 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG694550465
Side View
Table 63.0%Crown 38.9°Girdle: MED-STKPavilion 38.8°Culet: NoneDepth 67.4%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: $1,090 USD|Low: $208 USD|High: $1,160 USD|Avg: $571 USD|-2.7%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 9$208 USD
Retailer 8$230 USD
Retailer 11$310 USD
Retailer 4$409 USD
Retailer 2$422 USD
Retailer 10$459 USD
Retailer 7$565 USD
Retailer 6$685 USD
Retailer 3$792 USD
Retailer 5$1,071 USD
Brilliant Earth$1,090 USD

43 data points across 11 retailers

13 retailers$208 USD to $1,090 USD

A
Cheapest Retailer
-
$208 USD
Final sale: no returns
Retailer 2
-
$230 USD
View
Price last confirmed 12 days ago
B+
Retailer 3
-
$310 USD
View
A
Retailer 4
-
$409 USD
View
A
Retailer 5
-
$422 USD
View
A
Retailer 6
-
$459 USD
View
B+
Retailer 7
-
$565 USD
View
B+
Retailer 8
-
$680 USD
View
Retailer 9
-
$684 USD
View
Price last confirmed 89 days ago
B+
Retailer 10
-
$685 USD
View
B
Retailer 11
-
$792 USD
View
B
Retailer 12
-
$1,071 USD
View
Most Expensive
B
Brilliant Earth
21312327A · Nov 6
$1,090 USD
View
12 more retailers have this diamond
Prices start from $208 USDSave up to $882 USD

Carat Hunter is not affiliated with, endorsed by, or sponsored by any retailer listed. Retailer information is from publicly available sources and may not be current. Verify details directly with the retailer before purchasing. Return terms as we hold them. Check the retailer's own returns page before you buy.

A
1.31ct Cushion
$208 USD