CaratHunter
Plans
Cushion|Lab Grown|IGI

4.18ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG811627555

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG811627555

Diamond specifications and retailer prices

From £3,591 GBP
$4,811 USD
As of October 30, 2026
Save £9,986 GBP (74%) vs most expensive(unlock to see where)
13 retailers carry this diamond
Most expensive: £13,576 GBP at Taylor and Hart · As of October 31, 2026
View at Taylor and Hart

About this 4.18ct lab-grown cushion diamond

This 4.18ct 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 LG811627555 or 811627555. Listed at 13 retailers as of October 30, 2026, with prices from £3,591 to £13,576, a £9,986 spread on the same certified stone. Taylor and Hart lists it at £13,576. 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

4.18
Carat
D
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle31.3°
Pavilion angle29.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG811627555
Dimensions11.02 × 8.26 × 5.29 mm
L/W Ratio1.33
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
11.02 mm8.26 mm4.18 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG811627555
Side View
Table 63.0%Crown 31.3°Girdle: STK-VTKPavilion 29.1°Culet: NoneDepth 64.0%

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: £4,935 GBP|Low: £3,097 GBP|High: £16,061 GBP|Avg: £7,074 GBP|-13.8%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Taylor and Hart
October 30, 2026
Retailer 12£3,591 GBP
Retailer 2£3,675 GBP
Retailer 4£3,806 GBP
Retailer 7£3,836 GBP
Retailer 8£4,566 GBP
Retailer 1£4,935 GBP
Retailer 3£5,357 GBP
Retailer 9£5,889 GBP
Retailer 11£7,121 GBP
Retailer 6£7,923 GBP
Retailer 5£8,100 GBP
Retailer 10£10,576 GBP
Taylor and Hart£13,576 GBP

41 data points across 13 retailers

13 retailers£3,591 GBP to £13,576 GBP

A
Cheapest Retailer
-
£3,591 GBP
$4,811 USD
A
Retailer 2
-
£3,675 GBP
$4,924 USD
View
Final sale: no returns
Retailer 3
-
£3,806 GBP
$5,100 USD
View
Price last confirmed 15 days ago
A
Retailer 4
-
£3,836 GBP
$5,140 USD
View
A
Retailer 5
-
£4,566 GBP
$6,118 USD
View
A
Retailer 6
-
£4,935 GBP
View
A
Retailer 7
-
£5,357 GBP
View
A
Retailer 8
-
£5,889 GBP
$7,891 USD
View
B+
Retailer 9
-
£7,121 GBP
$9,541 USD
View
B+
Retailer 10
-
£7,923 GBP
View
B+
Retailer 11
-
£8,100 GBP
ZAR 175,337 ZAR
View
B+
Retailer 12
-
£10,576 GBP
$14,170 USD
View
Most Expensive
B
Taylor and Hart
5RC8QBX · Oct 31
£13,576 GBP
$18,191 USD
View
12 more retailers have this diamond
Prices start from £3,591 GBPSave up to £9,986 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
4.18ct Cushion
£3,591 GBP