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Marquise|Lab Grown|IGI

4.20ct E IF Marquise Lab Grown Diamond

ID • E/IF • IGI LG814643393

Shape and cutting style on the report: Hexagonal modified brilliant

Certificate IGI LG814643393

Diamond specifications and retailer prices

From £4,624 GBP
$6,195 USD
As of October 31, 2026
Save £20,983 GBP (82%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £25,607 GBP at Do Amore Diamonds · As of October 31, 2026
View at Do Amore Diamonds

About this 4.2ct lab-grown marquise diamond

This 4.2ct lab-grown marquise sits in the three to five carat band, graded E colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG814643393 or 814643393. Listed at 8 retailers as of October 31, 2026, with prices from £4,624 to £25,607, a £20,983 spread on the same certified stone. Do Amore Diamonds lists it at £25,607. 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
E
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.3°
Pavilion angle37.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG814643393
Dimensions15.41 × 8.04 × 5.44 mm
L/W Ratio1.92
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
15.41 mm8.04 mm4.20 ctE / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG814643393
Side View
Table 63.0%Crown 35.3°Girdle: MED-STKPavilion 37.8°Culet: NoneDepth 67.7%

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 31
Current: £25,607 GBP|Low: £1,908 GBP|High: £25,607 GBP|Avg: £7,598 GBP|+149.9%
Do Amore Diamonds
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 30, 2026
Retailer 4£4,624 GBP
Retailer 8£4,809 GBP
Retailer 9£5,541 GBP
Retailer 5£7,482 GBP
Retailer 3£10,417 GBP
Retailer 6£12,696 GBP
Retailer 2£16,030 GBP
Retailer 7£17,824 GBP
Do Amore Diamonds£25,607 GBP

38 data points across 9 retailers

8 retailers£4,624 GBP to £25,607 GBP

A
Cheapest Retailer
-
£4,624 GBP
$6,195 USD
A
Retailer 2
-
£4,809 GBP
$6,444 USD
View
Final sale: no returns
A
Retailer 3
-
£7,482 GBP
$10,025 USD
View
B+
Retailer 4
-
£10,417 GBP
View
B
Retailer 5
-
£12,696 GBP
$17,012 USD
View
B
Retailer 6
-
£16,030 GBP
View
B
Retailer 7
-
£17,824 GBP
$23,883 USD
View
Most Expensive
B
Do Amore Diamonds
20-E90950 · Oct 31
£25,607 GBP
$34,310 USD
View
7 more retailers have this diamond
Prices start from £4,624 GBPSave up to £20,983 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 Marquise
£4,624 GBP