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Marquise|Lab Grown|IGI

1.01ct G SI1 Marquise Lab Grown Diamond

ID • G/SI1 • IGI LG512205206

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG512205206

Diamond specifications and retailer prices

From £446 GBP
As of November 4, 2026
Save £421 GBP (49%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £1,472 GBP at NZ Jewellers · As of November 6, 2026
View at NZ Jewellers

About this 1.01ct lab-grown marquise diamond

This 1.01ct lab-grown marquise sits in the classic one-carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG512205206 or 512205206. Listed at 11 retailers as of November 4, 2026, with a 95% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

1.01
Carat
G
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle40.7°
Pavilion angle37.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG512205206
Dimensions9.41 × 5.26 × 3.34 mm
L/W Ratio1.79
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
9.41 mm5.26 mm1.01 ctG / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG512205206
Side View
Table 63.0%Crown 40.7°Girdle: STK-THKPavilion 37.2°Culet: NoneDepth 63.5%

Caratlytics Score

How it works →
B+
Very Good
Strong quality and value balance
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 4
Current: £867 GBP|Low: £433 GBP|High: £2,458 GBP|Avg: £955 GBP|+1.5%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 3£446 GBP
Retailer 5£451 GBP
Retailer 6£559 GBP
Retailer 8£654 GBP
Retailer 7£858 GBP
Retailer 1£867 GBP
Retailer 4£1,389 GBP
Retailer 2£2,428 GBP

43 data points across 8 retailers

11 retailers£446 GBP to £867 GBP

B+
Cheapest Retailer
-
£446 GBP
B
Retailer 2
-
£451 GBP
View
B
Retailer 3
-
£505 GBP
View
Retailer 4
-
£559 GBP
View
Price last confirmed 21 days ago
B
Retailer 5
-
£559 GBP
View
B
Retailer 6
-
£654 GBP
View
B
Retailer 7
-
£858 GBP
View
B
Retailer 8
-
£867 GBP
View
Retailer 9
-
£1,389 GBP
View
Price under review
Most Expensive
NZ Jewellers
4b1eb1ca-f44e-4dfd-8738-cdaf3e787deb · Nov 6
£1,472 GBP
$1,981 USD
View
Price under review
9 more retailers have this diamond
Prices start from £446 GBPSave up to £421 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.

B+
1.01ct Marquise
£446 GBP