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Marquise|Lab Grown|IGI

4.01ct G SI1 Marquise Lab Grown Diamond

ID • G/SI1 • IGI LG678527855

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG678527855

Diamond specifications and retailer prices

From £356 GBP
$477 USD
As of October 30, 2026
Save £1,502 GBP (81%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £1,858 GBP at Rare Carat · As of November 1, 2026
View at Rare Carat

About this 4.01ct lab-grown marquise diamond

This 4.01ct lab-grown marquise sits in the three to five carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG678527855 or 678527855. Listed at 14 retailers as of October 30, 2026, with prices from £356 to £1,858, a £1,502 spread on the same certified stone. Rare Carat lists it at £1,858. 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

4.01
Carat
G
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle41.7°
Pavilion angle34.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG678527855
Dimensions16.35 × 8.19 × 5.17 mm
L/W Ratio2.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
16.35 mm8.19 mm4.01 ctG / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG678527855
Side View
Table 59.0%Crown 41.7°Girdle: MED-STKPavilion 34.3°Culet: NoneDepth 63.1%

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: £1,858 GBP|Low: £356 GBP|High: £4,247 GBP|Avg: £1,244 GBP
Rare Carat
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
Retailer 16
Retailer 17
November 1, 2026
Retailer 12£356 GBP
Retailer 6£399 GBP
Retailer 2£418 GBP
Retailer 13£442 GBP
Retailer 17£487 GBP
Retailer 14£549 GBP
Retailer 5£690 GBP
Retailer 16£695 GBP
Retailer 10£733 GBP
Retailer 7£965 GBP
Retailer 4£999 GBP
Retailer 11£1,187 GBP
Retailer 3£1,420 GBP
Retailer 15£1,632 GBP
Rare Carat£1,858 GBP
Retailer 9£3,312 GBP
Retailer 8£4,247 GBP

5 data points across 17 retailers

14 retailers£356 GBP to £1,858 GBP

A
Cheapest Retailer
-
£356 GBP
$477 USD
A
Retailer 2
-
£399 GBP
$535 USD
View
A
Retailer 3
-
£418 GBP
View
A
Retailer 4
-
£442 GBP
$592 USD
View
A
Retailer 5
-
£487 GBP
HK$5,100 HKD
View
A
Retailer 6
-
£549 GBP
$735 USD
View
B+
Retailer 7
-
£690 GBP
$924 USD
View
A
Retailer 8
-
£695 GBP
$931 USD
View
A
Retailer 9
-
£733 GBP
View
B+
Retailer 10
-
£999 GBP
$1,339 USD
View
B+
Retailer 11
-
£1,187 GBP
$1,591 USD
View
B
Retailer 12
-
£1,420 GBP
$1,903 USD
View
B
Retailer 13
-
£1,632 GBP
View
Most Expensive
B
Rare Carat
KI8555278KF678 · Nov 1
£1,858 GBP
$2,490 USD
View
13 more retailers have this diamond
Prices start from £356 GBPSave up to £1,502 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
4.01ct Marquise
£356 GBP