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Cushion|Lab Grown|IGI

1.28ct E FL Cushion Lab Grown Diamond

VG • E/FL • IGI LG831680109

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

Certificate IGI LG831680109

Diamond specifications and retailer prices

From £315 GBP
$422 USD
As of October 30, 2026
Save £1,103 GBP (78%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £1,418 GBP at Brilliant Earth · As of October 30, 2026
View at Brilliant Earth

About this 1.28ct lab-grown cushion diamond

This 1.28ct lab-grown cushion sits in the one-and-a-quarter to one-and-a-half carat band, graded E colour (colourless) and FL clarity (flawless or internally-flawless), with a very-good cut grade and certified by IGI LG831680109 or 831680109. Listed at 10 retailers as of October 30, 2026, with prices from £315 to £1,418, a £1,103 spread on the same certified stone. Brilliant Earth lists it at £1,418. 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

1.28
Carat
E
Colour
FL
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.7°
Pavilion angle36°
OriginLab Grown
Grading LabIGI
CertificateIGI LG831680109
Dimensions6.10 × 6.07 × 4.05 mm
L/W Ratio1.00
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
6.10 mm6.07 mm1.28 ctE / FL
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG831680109
Side View
Table 60.0%Crown 36.7°Girdle: STK-VTKPavilion 36°Culet: NoneDepth 66.7%

Caratlytics Score

How it works →
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: Oct 30
Current: £1,418 GBP|Low: £315 GBP|High: £2,023 GBP|Avg: £853 GBP|-29.9%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 30, 2026
Retailer 9£315 GBP
Retailer 3£370 GBP
Retailer 8£459 GBP
Retailer 2£555 GBP
Retailer 4£630 GBP
Retailer 6£681 GBP
Retailer 7£1,149 GBP
Retailer 10£1,163 GBP
Retailer 5£1,340 GBP
Brilliant Earth£1,418 GBP

2 data points across 10 retailers

10 retailers£315 GBP to £1,418 GBP

A
Cheapest Retailer
-
£315 GBP
$422 USD
Final sale: no returns
A
Retailer 2
-
£370 GBP
View
A
Retailer 3
-
£459 GBP
$615 USD
View
A
Retailer 4
-
£555 GBP
$744 USD
View
A
Retailer 5
-
£630 GBP
View
A
Retailer 6
-
£681 GBP
$912 USD
View
B
Retailer 7
-
£1,149 GBP
$1,540 USD
View
B
Retailer 8
-
£1,163 GBP
SGD 2,106 SGD
View
B
Retailer 9
-
£1,340 GBP
$1,795 USD
View
Most Expensive
B
Brilliant Earth
22348455A · Oct 30
£1,418 GBP
$1,900 USD
View
9 more retailers have this diamond
Prices start from £315 GBPSave up to £1,103 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
1.28ct Cushion
£315 GBP