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Cushion|Lab Grown|IGI

4.25ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG780665784

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG780665784

Diamond specifications and retailer prices

From £3,069 GBP
$4,078 USD
As of October 29, 2026
Save £16,370 GBP (84%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £19,439 GBP at Do Amore Diamonds · As of October 28, 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 LG780665784 or 780665784. Listed at 11 retailers as of October 28, 2026, with prices from £3,069 to £19,439, a £16,370 spread on the same certified stone. Do Amore Diamonds lists it at £19,439. 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 angle33.8°
Pavilion angle34.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG780665784
Dimensions11.12 × 8.53 × 5.66 mm
L/W Ratio1.30
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
11.12 mm8.53 mm4.25 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG780665784
Side View
Table 60.0%Crown 33.8°Girdle: STK-THKPavilion 34.8°Culet: NoneDepth 66.4%

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: £19,439 GBP|Low: £3,069 GBP|High: £24,730 GBP|Avg: £9,527 GBP|-21.4%
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
October 29, 2026
Retailer 9£3,069 GBP
Retailer 5£3,146 GBP
Retailer 10£3,562 GBP
Retailer 12£4,272 GBP
Retailer 8£5,078 GBP
Retailer 2£5,991 GBP
Retailer 3£6,406 GBP
Retailer 6£7,488 GBP
Retailer 7£8,640 GBP
Retailer 11£16,798 GBP
Do Amore Diamonds£19,439 GBP
Retailer 4£20,605 GBP

27 data points across 12 retailers

11 retailers£3,069 GBP to £19,439 GBP

A+
Cheapest Retailer
-
£3,069 GBP
$4,078 USD
A
Retailer 2
-
£3,146 GBP
$4,180 USD
View
A
Retailer 3
-
£3,562 GBP
$4,733 USD
View
A
Retailer 4
-
£4,272 GBP
$5,677 USD
View
Final sale: no returns
A
Retailer 5
-
£5,078 GBP
$6,748 USD
View
A
Retailer 6
-
£5,991 GBP
€7,581 EUR
View
A
Retailer 7
-
£6,406 GBP
$8,512 USD
View
Price last confirmed 80 days ago
B+
Retailer 8
-
£7,488 GBP
View
B+
Retailer 9
-
£8,640 GBP
$11,480 USD
View
B
Retailer 10
-
£16,798 GBP
$22,320 USD
View
Most Expensive
B
Do Amore Diamonds
27-3F57FA657 · Oct 28
£19,439 GBP
$25,830 USD
View
10 more retailers have this diamond
Prices start from £3,069 GBPSave up to £16,370 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
£3,069 GBP