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Cushion|Lab Grown|IGI

4.28ct D FL Cushion Lab Grown Diamond

VG • D/FL • IGI LG804665090

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

Certificate IGI LG804665090

Diamond specifications and retailer prices

From £3,044 GBP
$4,079 USD
As of October 30, 2026
Save £16,226 GBP (84%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £19,270 GBP at Do Amore Diamonds · As of October 31, 2026
View at Do Amore Diamonds

About this 4.28ct lab-grown cushion diamond

This 4.28ct lab-grown cushion sits in the three to five carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a very-good cut grade and certified by IGI LG804665090 or 804665090. Listed at 10 retailers as of October 30, 2026, with prices from £3,044 to £19,270, a £16,226 spread on the same certified stone. Do Amore Diamonds lists it at £19,270. 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

4.28
Carat
D
Colour
FL
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle38.8°
Pavilion angle37.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG804665090
Dimensions9.41 × 9.32 × 6.23 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
9.41 mm9.32 mm4.28 ctD / FL
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG804665090
Side View
Table 64.0%Crown 38.8°Girdle: STK-THKPavilion 37.1°Culet: NoneDepth 66.8%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: £19,270 GBP|Low: £3,044 GBP|High: £24,696 GBP|Avg: £8,370 GBP|-22.0%
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 30, 2026
Retailer 2£3,044 GBP
Retailer 6£3,295 GBP
Retailer 4£3,573 GBP
Retailer 9£4,265 GBP
Retailer 8£5,071 GBP
Retailer 5£6,199 GBP
Retailer 10£6,394 GBP
Retailer 7£7,467 GBP
Retailer 3£9,896 GBP
Do Amore Diamonds£19,270 GBP

26 data points across 10 retailers

10 retailers£3,044 GBP to £19,270 GBP

A
Cheapest Retailer
-
£3,044 GBP
$4,079 USD
A
Retailer 2
-
£3,295 GBP
$4,415 USD
View
A
Retailer 3
-
£3,573 GBP
$4,787 USD
View
A
Retailer 4
-
£4,265 GBP
$5,714 USD
View
Final sale: no returns
A
Retailer 5
-
£5,071 GBP
$6,795 USD
View
A
Retailer 6
-
£6,199 GBP
€7,910 EUR
View
Retailer 7
-
£6,394 GBP
$8,567 USD
View
Price last confirmed 82 days ago
B+
Retailer 8
-
£7,467 GBP
View
B+
Retailer 9
-
£9,896 GBP
$13,260 USD
View
Most Expensive
B
Do Amore Diamonds
27-29F68735D · Oct 31
£19,270 GBP
$25,820 USD
View
9 more retailers have this diamond
Prices start from £3,044 GBPSave up to £16,226 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
4.28ct Cushion
£3,044 GBP