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Marquise|Lab Grown|IGI

4.00ct F SI1 Marquise Lab Grown Diamond

ID • F/SI1 • IGI LG778629621

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG778629621

Diamond specifications and retailer prices

From £559 GBP
$750 USD
As of November 1, 2026
Save £979 GBP (64%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: £1,538 GBP at MOH London · As of October 29, 2026
View at MOH London

About this 4ct lab-grown marquise diamond

This 4ct lab-grown marquise sits in the three to five carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG778629621 or 778629621. Listed at 5 retailers as of October 29, 2026, with prices from £559 to £1,538, a £979 spread on the same certified stone. MOH London lists it at £1,538. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

4.00
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishVery Good
SymmetryExcellent
FluorescenceNone
Crown angle33.8°
Pavilion angle39°
OriginLab Grown
Grading LabIGI
CertificateIGI LG778629621
Dimensions15.95 × 8.30 × 5.00 mm
L/W Ratio1.92
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
15.95 mm8.30 mm4.00 ctF / SI1
OriginLab Grown
CutIdeal
PolishVery Good
SymmetryExcellent
FluorescenceNone
CertificateIGI LG778629621
Side View
Table 64.0%Crown 33.8°Girdle: MED-STKPavilion 39°Culet: NoneDepth 60.2%

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: Nov 1
Current: £1,538 GBP|Low: £559 GBP|High: £1,548 GBP|Avg: £863 GBP|+0.6%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 2, 2026
Retailer 3£559 GBP
Retailer 2£683 GBP
Retailer 4£724 GBP
Retailer 5£837 GBP
MOH London£1,538 GBP

39 data points across 5 retailers

5 retailers£559 GBP to £1,538 GBP

B+
Cheapest Retailer
-
£559 GBP
$750 USD
A
Retailer 2
-
£683 GBP
View
A
Retailer 3
-
£724 GBP
$971 USD
View
B+
Retailer 4
-
£837 GBP
$1,123 USD
View
Most Expensive
B
MOH London
LG778629621 · Oct 29
£1,538 GBP
View
4 more retailers have this diamond
Prices start from £559 GBPSave up to £979 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
4.00ct Marquise
£559 GBP