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Cushion|Lab Grown|IGI

4.25ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG780665477

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG780665477

Diamond specifications and retailer prices

From £3,062 GBP
$4,078 USD
As of October 29, 2026
Save £15,576 GBP (84%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £18,638 GBP at Do Amore Diamonds · As of October 30, 2026
View at Do Amore Diamonds

About this 4.25ct lab-grown cushion diamond

This 4.25ct 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 LG780665477 or 780665477. Listed at 11 retailers as of October 29, 2026, with prices from £3,062 to £18,638, a £15,576 spread on the same certified stone. Do Amore Diamonds lists it at £18,638. 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

4.25
Carat
D
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.9°
Pavilion angle34.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG780665477
Dimensions10.79 × 8.51 × 5.67 mm
L/W Ratio1.27
Girdle conditionFaceted
Culet sizePointed
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
10.79 mm8.51 mm4.25 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG780665477
Side View
Table 58.0%Crown 34.9°Girdle: THK-VTKPavilion 34.3°Culet: NoneDepth 66.6%

Caratlytics Score

How it works →
A+
Exceptional
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: £18,638 GBP|Low: £3,062 GBP|High: £24,676 GBP|Avg: £8,439 GBP|-24.5%
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
October 30, 2026
Retailer 9£3,062 GBP
Retailer 5£3,139 GBP
Retailer 2£3,526 GBP
Retailer 11£4,263 GBP
Retailer 8£5,067 GBP
Retailer 4£5,977 GBP
Retailer 3£6,392 GBP
Retailer 6£7,471 GBP
Retailer 7£8,621 GBP
Retailer 10£16,761 GBP
Do Amore Diamonds£18,638 GBP

28 data points across 11 retailers

11 retailers£3,062 GBP to £18,638 GBP

A+
Cheapest Retailer
-
£3,062 GBP
$4,078 USD
A
Retailer 2
-
£3,139 GBP
$4,180 USD
View
A
Retailer 3
-
£3,526 GBP
$4,695 USD
View
A
Retailer 4
-
£4,263 GBP
$5,677 USD
View
Final sale: no returns
A
Retailer 5
-
£5,067 GBP
$6,748 USD
View
A
Retailer 6
-
£5,977 GBP
€7,581 EUR
View
Retailer 7
-
£6,392 GBP
$8,512 USD
View
Price last confirmed 81 days ago
B+
Retailer 8
-
£7,471 GBP
View
B+
Retailer 9
-
£8,621 GBP
$11,480 USD
View
B
Retailer 10
-
£16,761 GBP
$22,320 USD
View
Most Expensive
B
Do Amore Diamonds
27-6EADC235F · Oct 30
£18,638 GBP
$24,820 USD
View
10 more retailers have this diamond
Prices start from £3,062 GBPSave up to £15,576 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+
4.25ct Cushion
£3,062 GBP