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Cushion|Lab Grown|IGI

4.26ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG804659469

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG804659469

Diamond specifications and retailer prices

From £3,498 GBP
$4,648 USD
As of October 29, 2026
Save £13,337 GBP (79%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £16,835 GBP at Brilliant Earth · As of October 28, 2026
View at Brilliant Earth

About this 4.26ct lab-grown cushion diamond

This 4.26ct 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 LG804659469 or 804659469. Listed at 11 retailers as of October 28, 2026, with prices from £3,498 to £16,835, a £13,337 spread on the same certified stone. Brilliant Earth lists it at £16,835. 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

4.26
Carat
D
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle37.8°
Pavilion angle36.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG804659469
Dimensions10.46 × 8.75 × 5.88 mm
L/W Ratio1.20
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
10.46 mm8.75 mm4.26 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG804659469
Side View
Table 60.0%Crown 37.8°Girdle: MED-STKPavilion 36.7°Culet: NoneDepth 67.2%

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 29
Current: £16,835 GBP|Low: £3,498 GBP|High: £17,362 GBP|Avg: £8,913 GBP|-3.0%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
October 29, 2026
Retailer 5£3,498 GBP
Retailer 7£3,548 GBP
Retailer 6£5,183 GBP
Retailer 8£5,277 GBP
Retailer 11£6,130 GBP
Retailer 2£6,281 GBP
Retailer 3£6,450 GBP
Retailer 4£8,487 GBP
Retailer 10£11,003 GBP
Retailer 9£14,589 GBP
Brilliant Earth£16,835 GBP

39 data points across 11 retailers

11 retailers£3,498 GBP to £16,835 GBP

A
Cheapest Retailer
-
£3,498 GBP
$4,648 USD
A
Retailer 2
-
£3,548 GBP
$4,715 USD
View
A
Retailer 3
-
£5,183 GBP
HK$53,800 HKD
View
A
Retailer 4
-
£5,277 GBP
View
A
Retailer 5
-
£6,130 GBP
$8,145 USD
View
Price last confirmed 10 days ago
A
Retailer 6
-
£6,281 GBP
€7,949 EUR
View
B+
Retailer 7
-
£6,450 GBP
$8,570 USD
View
B+
Retailer 8
-
£8,487 GBP
View
B+
Retailer 9
-
£11,003 GBP
$14,620 USD
View
B+
Retailer 10
-
£14,589 GBP
$19,385 USD
View
Most Expensive
B
Brilliant Earth
20869191Y · Oct 28
£16,835 GBP
$22,370 USD
View
10 more retailers have this diamond
Prices start from £3,498 GBPSave up to £13,337 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
4.26ct Cushion
£3,498 GBP