CaratHunter
Plans
Cushion|Lab Grown|IGI

4.28ct D FL Cushion Lab Grown Diamond

EX • D/FL • IGI LG754594736

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG754594736

Diamond specifications and retailer prices

From £3,595 GBP
$4,817 USD
As of October 30, 2026
Save £16,525 GBP (82%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £20,120 GBP at With Clarity · As of October 31, 2026
View at With Clarity

About this 4.28ct lab-grown cushion diamond

This 4.28ct 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 LG754594736 or 754594736. Listed at 14 retailers as of October 30, 2026, with prices from £3,595 to £20,120, a £16,525 spread on the same certified stone. With Clarity lists it at £20,120. 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

4.28
Carat
D
Colour
FL
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.4°
Pavilion angle37.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG754594736
Dimensions10.72 × 8.90 × 5.80 mm
L/W Ratio1.20
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
10.72 mm8.90 mm4.28 ctD / FL
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG754594736
Side View
Table 61.0%Crown 34.4°Girdle: STK-THKPavilion 37.1°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 30
Current: £4,732 GBP|Low: £3,595 GBP|High: £25,185 GBP|Avg: £9,873 GBP|-5.4%
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
With Clarity
October 31, 2026
Retailer 6£3,595 GBP
Retailer 1£4,732 GBP
Retailer 13£4,757 GBP
Retailer 10£4,938 GBP
Retailer 2£6,259 GBP
Retailer 5£6,426 GBP
Retailer 7£7,125 GBP
Retailer 12£8,105 GBP
Retailer 3£8,455 GBP
Retailer 8£9,896 GBP
Retailer 4£10,963 GBP
Retailer 11£13,585 GBP
Retailer 9£13,778 GBP
With Clarity£20,120 GBP

36 data points across 14 retailers

14 retailers£3,595 GBP to £20,120 GBP

A
Cheapest Retailer
-
£3,595 GBP
$4,817 USD
A
Retailer 2
-
£4,732 GBP
$6,341 USD
View
A
Retailer 3
-
£4,757 GBP
HK$49,800 HKD
View
A
Retailer 4
-
£4,938 GBP
View
A
Retailer 5
-
£6,259 GBP
€7,987 EUR
View
B+
Retailer 6
-
£6,426 GBP
$8,610 USD
View
B+
Retailer 7
-
£7,125 GBP
$9,547 USD
View
B+
Retailer 8
-
£8,105 GBP
ZAR 175,446 ZAR
View
B+
Retailer 9
-
£8,455 GBP
View
B+
Retailer 10
-
£9,896 GBP
$13,260 USD
View
B+
Retailer 11
-
£10,963 GBP
$14,689 USD
View
B+
Retailer 12
-
£13,585 GBP
$18,203 USD
View
B+
Retailer 13
-
£13,778 GBP
SGD 24,947 SGD
View
Most Expensive
B
With Clarity
754594736 · Oct 31
£20,120 GBP
$26,959 USD
View
13 more retailers have this diamond
Prices start from £3,595 GBPSave up to £16,525 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
4.28ct Cushion
£3,595 GBP