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Marquise|Lab Grown|IGI

1.31ct E SI1 Marquise Lab Grown Diamond

ID • E/SI1 • IGI LG524239249

Shape and cutting style on the report: Marquise brilliant

Certificate IGI LG524239249

Diamond specifications and retailer prices

From £232 GBP
As of November 4, 2026
Save £843 GBP (78%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: £1,075 GBP at Reve Diamonds · As of November 6, 2026
View at Reve Diamonds

About this 1.31ct lab-grown marquise diamond

This 1.31ct lab-grown marquise sits in the one-and-a-quarter to one-and-a-half carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG524239249 or 524239249. Listed at 17 retailers as of November 4, 2026, with prices from £232 to £1,075, a £843 spread on the same certified stone. Reve Diamonds lists it at £1,075. 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

1.31
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.1°
Pavilion angle39.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG524239249
Dimensions11.15 × 5.86 × 3.56 mm
L/W Ratio1.90
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
11.15 mm5.86 mm1.31 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG524239249
Side View
Table 59.0%Crown 34.1°Girdle: MED-STKPavilion 39.7°Culet: NoneDepth 60.8%

Caratlytics Score

How it works →
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: Nov 4
Current: £449 GBP|Low: £199 GBP|High: £1,042 GBP|Avg: £481 GBP|+2.2%
Retailer 1
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
November 6, 2026
Retailer 13£207 GBP
Retailer 6£232 GBP
Retailer 4£241 GBP
Retailer 14£257 GBP
Retailer 10£366 GBP
Retailer 11£375 GBP
Retailer 12£421 GBP
Retailer 3£424 GBP
Retailer 1£449 GBP
Retailer 5£501 GBP
Retailer 8£666 GBP
Retailer 2£827 GBP
Retailer 7£1,030 GBP
Retailer 9£1,033 GBP

42 data points across 14 retailers

17 retailers£232 GBP to £1,075 GBP

Retailer 1
-
£207 GBP
Price last confirmed 16 days ago
A
Retailer 2
-
£232 GBP
View
Final sale: no returns
Retailer 3
-
£241 GBP
View
Price last confirmed 16 days ago
Retailer 4
-
£257 GBP
View
Price last confirmed 15 days ago
Retailer 5
-
£257 GBP
View
Price last confirmed 21 days ago
B+
Retailer 6
-
£366 GBP
View
B+
Retailer 7
-
£375 GBP
View
Retailer 8
-
£421 GBP
View
Price last confirmed 10 days ago
B+
Retailer 9
-
£424 GBP
View
B+
Retailer 10
-
£449 GBP
View
B+
Retailer 11
-
£501 GBP
View
B
Retailer 12
-
£666 GBP
View
Retailer 13
-
£827 GBP
View
Price last confirmed 15 days ago
B
Retailer 14
-
£864 GBP
View
B
Retailer 15
-
£1,030 GBP
View
B
Retailer 16
-
£1,033 GBP
View
Most Expensive
B
Reve Diamonds
4DB39F678 · Nov 6
£1,075 GBP
$1,446 USD
View
16 more retailers have this diamond
Prices start from £232 GBPSave up to £843 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
1.31ct Marquise
£232 GBP