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Cushion|Lab Grown|IGI

4.28ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG846664135

Shape and cutting style on the report: Round cornered rectangular modified brilliant

Certificate IGI LG846664135

Diamond specifications and retailer prices

From £3,877 GBP
$5,195 USD
As of October 31, 2026
Save £16,049 GBP (81%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: £19,926 GBP at With Clarity · As of October 31, 2026
View at With Clarity

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 top-tier cut grade and certified by IGI LG846664135 or 846664135. Listed at 5 retailers as of October 31, 2026, with prices from £3,877 to £19,926, a £16,049 spread on the same certified stone. With Clarity lists it at £19,926. Lab-grown prices in the 2ct and up range have fallen 40 to 60% over the last 18 months. Use the cross-retailer spread above to find the lowest current listing.

The 4Cs

4.28
Carat
D
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle31.7°
Pavilion angle43.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG846664135
Dimensions10.51 × 7.58 × 5.17 mm
L/W Ratio1.39
Girdle conditionFaceted
Culet sizeLarge
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
10.51 mm7.58 mm4.28 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG846664135
Side View
Table 59.0%Crown 31.7°Girdle: MED-STKPavilion 43.4°Culet: LargeDepth 68.2%

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 31
Current: £3,877 GBP|Low: £3,877 GBP|High: £22,141 GBP|Avg: £11,934 GBP
Retailer 1
Retailer 2
Retailer 3
Retailer 4
With Clarity
October 31, 2026
Retailer 1£3,877 GBP
Retailer 2£4,944 GBP
Retailer 3£5,006 GBP
Retailer 4£11,292 GBP
With Clarity£19,926 GBP

4 data points across 5 retailers

5 retailers£3,877 GBP to £19,926 GBP

A
Cheapest Retailer
-
£3,877 GBP
$5,195 USD
A
Retailer 2
-
£4,944 GBP
$6,624 USD
View
A
Retailer 3
-
£5,006 GBP
$6,707 USD
View
B+
Retailer 4
-
£11,292 GBP
$15,130 USD
View
Most Expensive
B
With Clarity
846664135 · Oct 31
£19,926 GBP
$26,699 USD
View
4 more retailers have this diamond
Prices start from £3,877 GBPSave up to £16,049 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
£3,877 GBP