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Cushion|Lab Grown|IGI

4.20ct D FL Cushion Lab Grown Diamond

EX • D/FL • IGI LG803623561

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

Certificate IGI LG803623561

Diamond specifications and retailer prices

From £3,557 GBP
$4,766 USD
As of October 31, 2026
Save £21,915 GBP (86%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £25,472 GBP at Do Amore Diamonds · As of October 30, 2026
View at Do Amore Diamonds

About this 4.2ct lab-grown cushion diamond

This 4.2ct 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 LG803623561 or 803623561. Listed at 16 retailers as of October 30, 2026, with prices from £3,557 to £25,472, a £21,915 spread on the same certified stone. Do Amore Diamonds lists it at £25,472. 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

4.20
Carat
D
Colour
FL
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle39.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG803623561
Dimensions9.40 × 9.21 × 6.25 mm
L/W Ratio1.02
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
9.40 mm9.21 mm4.20 ctD / FL
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG803623561
Side View
Table 61.0%Crown 36°Girdle: MED-STKPavilion 39.6°Culet: NoneDepth 67.9%

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: £25,472 GBP|Low: £3,557 GBP|High: £27,547 GBP|Avg: £9,816 GBP|-7.5%
Do Amore Diamonds
Retailer 2
Retailer 3
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Retailer 11
Retailer 12
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Retailer 18
October 31, 2026
Retailer 16£3,557 GBP
Retailer 4£4,146 GBP
Retailer 7£4,294 GBP
Retailer 15£4,314 GBP
Retailer 9£4,725 GBP
Retailer 2£6,082 GBP
Retailer 17£6,195 GBP
Retailer 6£6,733 GBP
Retailer 13£7,468 GBP
Retailer 14£9,697 GBP
Retailer 12£10,089 GBP
Retailer 10£10,728 GBP
Retailer 18£11,820 GBP
Retailer 11£13,037 GBP
Retailer 8£14,909 GBP
Retailer 3£16,790 GBP
Retailer 5£22,271 GBP
Do Amore Diamonds£25,472 GBP

37 data points across 18 retailers

16 retailers£3,557 GBP to £25,472 GBP

A
Cheapest Retailer
-
£3,557 GBP
$4,766 USD
A
Retailer 2
-
£4,146 GBP
$5,555 USD
View
Final sale: no returns
Retailer 3
-
£4,294 GBP
$5,754 USD
View
Price last confirmed 15 days ago
A
Retailer 4
-
£4,314 GBP
$5,780 USD
View
A
Retailer 5
-
£6,082 GBP
View
A
Retailer 6
-
£6,195 GBP
$8,301 USD
View
B+
Retailer 7
-
£6,733 GBP
View
B+
Retailer 8
-
£7,468 GBP
€9,530 EUR
View
B+
Retailer 9
-
£9,697 GBP
View
B+
Retailer 10
-
£10,089 GBP
ZAR 218,377 ZAR
View
B+
Retailer 11
-
£11,820 GBP
$15,837 USD
View
B+
Retailer 12
-
£13,037 GBP
$17,468 USD
View
B
Retailer 13
-
£14,909 GBP
$19,976 USD
View
B
Retailer 14
-
£16,790 GBP
$22,497 USD
View
B
Retailer 15
-
£22,271 GBP
$29,841 USD
View
Most Expensive
B
Do Amore Diamonds
27-81A9E32CB · Oct 30
£25,472 GBP
$34,130 USD
View
15 more retailers have this diamond
Prices start from £3,557 GBPSave up to £21,915 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
4.20ct Cushion
£3,557 GBP