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Marquise|Lab Grown|IGI

4.00ct F SI1 Marquise Lab Grown Diamond

ID • F/SI1 • IGI LG817634505

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG817634505

Diamond specifications and retailer prices

From £3,957 GBP
$5,310 USD
As of November 2, 2026
3 retailers carry this diamond
Most expensive: £3,957 GBP at Brilliant Earth
View at Brilliant Earth

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 LG817634505 or 817634505. Listed at 3 retailers as of November 2, 2026. 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
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.9°
Pavilion angle40.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG817634505
Dimensions15.61 × 8.24 × 5.30 mm
L/W Ratio1.89
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
15.61 mm8.24 mm4.00 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG817634505
Side View
Table 56.0%Crown 36.9°Girdle: MED-STKPavilion 40.2°Culet: NoneDepth 64.3%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Nov 2
Current: £3,957 GBP|Low: £402 GBP|High: £3,957 GBP|Avg: £1,039 GBP
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
August 31, 2026
Retailer 9£458 GBP
Retailer 3£559 GBP
Retailer 6£616 GBP
Retailer 4£643 GBP
Retailer 2£668 GBP
Retailer 8£850 GBP
Retailer 7£990 GBP
Retailer 5£1,906 GBP
Brilliant Earth£3,957 GBP

22 data points across 9 retailers

3 retailers

Retailer 1
-
£458 GBP
HK$4,800 HKD
Price last confirmed 59 days ago
Retailer 2
-
£1,906 GBP
$2,557 USD
View
Price last confirmed 77 days ago
Most Expensive
B
Brilliant Earth
20781924A · Nov 2
£3,957 GBP
$5,310 USD
View
2 more retailers have this diamond

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.

B
4.00ct Marquise
£3,957 GBP