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Cushion|Lab Grown|IGI

4.20ct D FL Cushion Lab Grown Diamond

ID • D/FL • IGI LG780662186

Shape and cutting style on the report: Antique cushion cut

Certificate IGI LG780662186

Diamond specifications and retailer prices

From £3,051 GBP
$4,088 USD
As of October 29, 2026
Save £8,823 GBP (74%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £11,874 GBP at MOH London · As of October 29, 2026
View at MOH London

About this 4.2ct lab-grown cushion diamond

This 4.2ct 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 LG780662186 or 780662186. Listed at 10 retailers as of October 29, 2026, with prices from £3,051 to £11,874, a £8,823 spread on the same certified stone. MOH London lists it at £11,874. 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

4.20
Carat
D
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.6°
Pavilion angle41.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG780662186
Dimensions10.92 × 8.47 × 5.81 mm
L/W Ratio1.29
Girdle conditionFaceted
Culet sizeLarge
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
10.92 mm8.47 mm4.20 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG780662186
Side View
Table 53.0%Crown 36.6°Girdle: THK-VTKPavilion 41.9°Culet: LargeDepth 68.6%

Caratlytics Score

How it works →
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 29
Current: £11,874 GBP|Low: £3,051 GBP|High: £26,174 GBP|Avg: £10,662 GBP|-4.0%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
October 31, 2026
Retailer 12£3,051 GBP
Retailer 10£3,197 GBP
Retailer 15£4,624 GBP
Retailer 9£4,694 GBP
Retailer 2£4,881 GBP
Retailer 3£5,200 GBP
Retailer 14£6,320 GBP
Retailer 8£6,321 GBP
Retailer 13£6,758 GBP
Retailer 6£9,001 GBP
Retailer 11£9,714 GBP
MOH London£11,874 GBP
Retailer 4£16,972 GBP
Retailer 7£22,154 GBP
Retailer 5£26,174 GBP

32 data points across 15 retailers

10 retailers£3,051 GBP to £11,874 GBP

A
Cheapest Retailer
-
£3,051 GBP
$4,088 USD
A
Retailer 2
-
£3,197 GBP
$4,284 USD
View
A
Retailer 3
-
£4,624 GBP
$6,195 USD
View
Final sale: no returns
A
Retailer 4
-
£4,694 GBP
$6,289 USD
View
A
Retailer 5
-
£4,881 GBP
$6,540 USD
View
A
Retailer 6
-
£6,320 GBP
$8,468 USD
View
A
Retailer 7
-
£6,321 GBP
$8,470 USD
View
B+
Retailer 8
-
£6,758 GBP
€8,624 EUR
View
B+
Retailer 9
-
£9,714 GBP
$13,016 USD
View
Most Expensive
B
MOH London
LG780662186 · Oct 29
£11,874 GBP
View
9 more retailers have this diamond
Prices start from £3,051 GBPSave up to £8,823 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
4.20ct Cushion
£3,051 GBP