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Cushion|Lab Grown|IGI

1.28ct E FL Cushion Lab Grown Diamond

GD • E/FL • IGI LG840622511

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

Certificate IGI LG840622511

Diamond specifications and retailer prices

From £315 GBP
$422 USD
As of October 30, 2026
Save £1,420 GBP (82%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: £1,735 GBP at Helzberg Diamonds · As of October 29, 2026
View at Helzberg Diamonds

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 standard cut grade and certified by IGI LG840622511 or 840622511. Listed at 17 retailers as of October 29, 2026, with prices from £315 to £1,735, a £1,420 spread on the same certified stone. Helzberg Diamonds lists it at £1,735. 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
Good
Cut

Specifications

CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.1°
Pavilion angle36.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG840622511
Dimensions6.20 × 6.14 × 4.10 mm
L/W Ratio1.01
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
6.20 mm6.14 mm1.28 ctE / FL
OriginLab Grown
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG840622511
Side View
Table 62.0%Crown 35.1°Girdle: MED-STKPavilion 36.2°Culet: NoneDepth 66.8%

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: £1,735 GBP|Low: £315 GBP|High: £2,023 GBP|Avg: £912 GBP
Helzberg Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
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Retailer 17
October 30, 2026
Retailer 6£315 GBP
Retailer 15£349 GBP
Retailer 10£370 GBP
Retailer 4£525 GBP
Retailer 14£526 GBP
Retailer 7£555 GBP
Retailer 12£589 GBP
Retailer 13£599 GBP
Retailer 11£630 GBP
Retailer 17£681 GBP
Retailer 5£1,149 GBP
Retailer 8£1,163 GBP
Retailer 9£1,209 GBP
Retailer 3£1,340 GBP
Retailer 16£1,364 GBP
Retailer 2£1,418 GBP
Helzberg Diamonds£1,735 GBP

17 data points across 17 retailers

17 retailers£315 GBP to £1,735 GBP

A
Cheapest Retailer
-
£315 GBP
$422 USD
Final sale: no returns
A
Retailer 2
-
£349 GBP
$467 USD
View
A
Retailer 3
-
£370 GBP
View
A
Retailer 4
-
£525 GBP
$703 USD
View
B+
Retailer 5
-
£526 GBP
$705 USD
View
A
Retailer 6
-
£555 GBP
$744 USD
View
A
Retailer 7
-
£589 GBP
€751 EUR
View
A
Retailer 8
-
£599 GBP
ZAR 12,963 ZAR
View
B+
Retailer 9
-
£630 GBP
View
B+
Retailer 10
-
£681 GBP
$912 USD
View
B
Retailer 11
-
£1,149 GBP
$1,540 USD
View
B
Retailer 12
-
£1,163 GBP
SGD 2,106 SGD
View
Retailer 13
-
£1,209 GBP
$1,620 USD
View
Price last confirmed 16 days ago
B
Retailer 14
-
£1,340 GBP
$1,795 USD
View
B
Retailer 15
-
£1,364 GBP
View
B
Retailer 16
-
£1,418 GBP
$1,900 USD
View
Most Expensive
B
Helzberg Diamonds
ZXZOKGMIILHH · Oct 29
£1,735 GBP
$2,325 USD
View
16 more retailers have this diamond
Prices start from £315 GBPSave up to £1,420 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