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Cushion|Lab Grown|IGI

4.18ct D FL Cushion Lab Grown Diamond

GD • D/FL • IGI LG816625974

Shape and cutting style on the report: Cushion modified brilliant

Certificate IGI LG816625974

Diamond specifications and retailer prices

From £3,020 GBP
$4,047 USD
As of October 30, 2026
Save £15,824 GBP (84%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £18,845 GBP at Do Amore Diamonds · As of October 31, 2026
View at Do Amore Diamonds

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 standard cut grade and certified by IGI LG816625974 or 816625974. Listed at 9 retailers as of October 30, 2026, with prices from £3,020 to £18,845, a £15,824 spread on the same certified stone. Do Amore Diamonds lists it at £18,845. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

4.18
Carat
D
Colour
FL
Clarity
Good
Cut

Specifications

CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle39.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG816625974
Dimensions10.12 × 8.46 × 6.18 mm
L/W Ratio1.20
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
10.12 mm8.46 mm4.18 ctD / FL
OriginLab Grown
CutGood
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG816625974
Side View
Table 59.0%Crown 36°Girdle: ThickPavilion 39.5°Culet: NoneDepth 73.0%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Oct 30
Current: £18,845 GBP|Low: £3,020 GBP|High: £24,136 GBP|Avg: £8,450 GBP|-21.9%
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 31, 2026
Retailer 3£3,020 GBP
Retailer 6£3,291 GBP
Retailer 5£3,424 GBP
Retailer 8£4,959 GBP
Retailer 2£6,011 GBP
Retailer 9£6,094 GBP
Retailer 7£7,553 GBP
Retailer 4£9,665 GBP
Do Amore Diamonds£18,845 GBP

28 data points across 9 retailers

9 retailers£3,020 GBP to £18,845 GBP

A
Cheapest Retailer
-
£3,020 GBP
$4,047 USD
A
Retailer 2
-
£3,291 GBP
$4,410 USD
View
A
Retailer 3
-
£3,424 GBP
$4,588 USD
View
A
Retailer 4
-
£4,959 GBP
$6,644 USD
View
B+
Retailer 5
-
£6,011 GBP
€7,671 EUR
View
Retailer 6
-
£6,094 GBP
$8,165 USD
View
Price last confirmed 13 days ago
B+
Retailer 7
-
£7,553 GBP
View
B
Retailer 8
-
£9,665 GBP
$12,950 USD
View
Most Expensive
B
Do Amore Diamonds
27-E8ED55DB1 · Oct 31
£18,845 GBP
$25,250 USD
View
8 more retailers have this diamond
Prices start from £3,020 GBPSave up to £15,824 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
£3,020 GBP