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Cushion|Lab Grown|IGI

1.31ct F SI1 Cushion Lab Grown Diamond

ID • F/SI1 • IGI LG578325204

Shape and cutting style on the report: Cushion brilliant

Certificate IGI LG578325204

Diamond specifications and retailer prices

From €316 EUR
$353 USD
As of October 25, 2026
3 retailers carry this diamond
Most expensive: €899 EUR at MOH London · As of October 19, 2026
View at MOH London

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 F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG578325204 or 578325204. Listed at 3 retailers as of October 19, 2026. 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
F
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.6°
Pavilion angle38.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG578325204
Dimensions7.81 × 5.69 × 3.87 mm
L/W Ratio1.37
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
7.81 mm5.69 mm1.31 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG578325204
Side View
Table 59.0%Crown 34.6°Girdle: THN-MEDPavilion 38.4°Culet: NoneDepth 68.0%

Caratlytics Score

No score right now
No retailer has confirmed this stone recently, so we are not scoring it. Prices below are as of the date shown.

Price History

Last verified: Oct 25
Current: €899 EUR|Low: €113 EUR|High: €1,423 EUR|Avg: €640 EUR|-5.0%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 18, 2026
Retailer 5€166 EUR
Retailer 3€316 EUR
Retailer 9€452 EUR
Retailer 6€498 EUR
Retailer 4€559 EUR
Retailer 7€646 EUR
Retailer 8€779 EUR
MOH London€899 EUR
Retailer 2€1,343 EUR

12 data points across 9 retailers

3 retailers€316 EUR to €899 EUR

Retailer 1
-
€316 EUR
$353 USD
Price last confirmed 7 days ago
Retailer 2
-
€559 EUR
$625 USD
View
Price last confirmed 11 days ago
Most Expensive
MOH London
LG578325204 · Oct 19
€899 EUR
£791 GBP
View
Price last confirmed 14 days ago
2 more retailers have this diamond

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.

1.31ct Cushion
€316 EUR