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Cushion|Lab Grown|IGI

1.20ct E FL Cushion Lab Grown Diamond

VG • E/FL • IGI LG830620137

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG830620137

Diamond specifications and retailer prices

From £319 GBP
$427 USD
As of October 30, 2026
Save £1,577 GBP (83%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £1,896 GBP at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 1.2ct lab-grown cushion diamond

This 1.2ct lab-grown cushion sits in the classic one-carat band, graded E colour (colourless) and FL clarity (flawless or internally-flawless), with a very-good cut grade and certified by IGI LG830620137 or 830620137. Listed at 8 retailers as of October 29, 2026, with prices from £319 to £1,896, a £1,577 spread on the same certified stone. Brilliant Earth lists it at £1,896. 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

1.20
Carat
E
Colour
FL
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.5°
Pavilion angle38.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG830620137
Dimensions7.78 × 5.28 × 3.54 mm
L/W Ratio1.47
Girdle conditionFaceted
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
7.78 mm5.28 mm1.20 ctE / FL
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG830620137
Side View
Table 62.0%Crown 35.5°Girdle: STK-VTKPavilion 38.2°Culet: NoneDepth 67.0%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Oct 30
Current: £1,896 GBP|Low: £319 GBP|High: £1,896 GBP|Avg: £889 GBP
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
October 30, 2026
Retailer 7£319 GBP
Retailer 3£374 GBP
Retailer 2£562 GBP
Retailer 5£613 GBP
Retailer 4£639 GBP
Retailer 8£1,124 GBP
Retailer 6£1,163 GBP
Brilliant Earth£1,896 GBP

2 data points across 8 retailers

8 retailers£319 GBP to £1,896 GBP

A
Cheapest Retailer
-
£319 GBP
$427 USD
Final sale: no returns
A
Retailer 2
-
£374 GBP
View
A
Retailer 3
-
£562 GBP
$753 USD
View
A
Retailer 4
-
£613 GBP
$821 USD
View
A
Retailer 5
-
£639 GBP
View
B
Retailer 6
-
£1,124 GBP
SGD 2,035 SGD
View
B
Retailer 7
-
£1,163 GBP
$1,559 USD
View
Most Expensive
B
Brilliant Earth
22348636A · Oct 29
£1,896 GBP
$2,540 USD
View
7 more retailers have this diamond
Prices start from £319 GBPSave up to £1,577 GBP

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
1.20ct Cushion
£319 GBP