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Cushion|Lab Grown|IGI

4.23ct D FL Cushion Lab Grown Diamond

EX • D/FL • IGI LG800662995

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG800662995

Diamond specifications and retailer prices

From £4,276 GBP
$5,729 USD
As of October 26, 2026
Save £21,654 GBP (84%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £25,930 GBP at With Clarity · As of October 30, 2026
View at With Clarity

About this 4.23ct lab-grown cushion diamond

This 4.23ct 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 LG800662995 or 800662995. Listed at 20 retailers as of October 26, 2026, with prices from £4,276 to £25,930, a £21,654 spread on the same certified stone. With Clarity lists it at £25,930. 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

4.23
Carat
D
Colour
FL
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle36.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG800662995
Dimensions11.41 × 8.58 × 5.59 mm
L/W Ratio1.33
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
11.41 mm8.58 mm4.23 ctD / FL
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG800662995
Side View
Table 62.0%Crown 35°Girdle: MED-STKPavilion 36.9°Culet: NoneDepth 65.2%

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 26
Current: £6,392 GBP|Low: £4,128 GBP|High: £25,438 GBP|Avg: £9,762 GBP|-0.2%
Retailer 1
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
Retailer 16
Retailer 17
Retailer 18
Retailer 19
With Clarity
October 30, 2026
Retailer 16£4,276 GBP
Retailer 6£4,752 GBP
Retailer 13£4,929 GBP
Retailer 4£5,041 GBP
Retailer 5£5,101 GBP
Retailer 19£5,105 GBP
Retailer 7£5,159 GBP
Retailer 1£6,392 GBP
Retailer 3£7,268 GBP
Retailer 14£8,065 GBP
Retailer 2£8,641 GBP
Retailer 15£10,443 GBP
Retailer 12£10,866 GBP
Retailer 17£11,430 GBP
Retailer 8£13,168 GBP
Retailer 9£13,765 GBP
Retailer 10£14,202 GBP
Retailer 18£15,015 GBP
Retailer 11£17,864 GBP
With Clarity£25,438 GBP

38 data points across 20 retailers

20 retailers£4,276 GBP to £25,930 GBP

A
Cheapest Retailer
-
£4,276 GBP
$5,729 USD
A
Retailer 2
-
£4,752 GBP
CA$8,844 CAD
View
A
Retailer 3
-
£4,929 GBP
$6,604 USD
View
Final sale: no returns
A
Retailer 4
-
£5,041 GBP
$6,754 USD
View
A
Retailer 5
-
£5,101 GBP
$6,835 USD
View
Retailer 6
-
£5,105 GBP
$6,840 USD
View
Price last confirmed 14 days ago
A
Retailer 7
-
£5,159 GBP
$6,913 USD
View
A
Retailer 8
-
£6,392 GBP
View
B+
Retailer 9
-
£7,268 GBP
View
B+
Retailer 10
-
£8,065 GBP
€10,292 EUR
View
B+
Retailer 11
-
£8,641 GBP
$11,578 USD
View
B+
Retailer 12
-
£10,443 GBP
View
B+
Retailer 13
-
£10,866 GBP
ZAR 235,196 ZAR
View
B
Retailer 14
-
£11,430 GBP
$15,315 USD
View
B
Retailer 15
-
£13,168 GBP
$17,644 USD
View
B+
Retailer 16
-
£13,765 GBP
$18,443 USD
View
B
Retailer 17
-
£14,202 GBP
$19,029 USD
View
B
Retailer 18
-
£15,015 GBP
$20,119 USD
View
B
Retailer 19
-
£17,864 GBP
$23,935 USD
View
Most Expensive
B
With Clarity
800662995 · Oct 30
£25,930 GBP
$34,743 USD
View
19 more retailers have this diamond
Prices start from £4,276 GBPSave up to £21,654 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
4.23ct Cushion
£4,276 GBP