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1.31ct H SI1 Round Lab Grown Diamond

ID • H/SI1 • IGI LG499105136

Shape and cutting style on the report: Round brilliant

Certificate IGI LG499105136

Diamond specifications and retailer prices

From £637 GBP
As of November 5, 2026
Save £2,128 GBP (77%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £2,766 GBP at MOH London · As of November 5, 2026
View at MOH London

About this 1.31ct lab-grown round diamond

This 1.31ct lab-grown round sits in the one-and-a-quarter to one-and-a-half carat band, graded H colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG499105136 or 499105136. Listed at 11 retailers as of November 5, 2026, with prices from £637 to £2,766, a £2,128 spread on the same certified stone. MOH London lists it at £2,766. 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
H
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.2°
Pavilion angle41.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG499105136
Dimensions6.95 × 6.99 × 4.36 mm
L/W Ratio1.01
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
6.95 mm6.99 mm1.31 ctH / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG499105136
Side View
Table 56.5%Crown 34.2°Girdle: MediumPavilion 41.1°Culet: NoneDepth 62.5%

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 5
Current: £2,766 GBP|Low: £637 GBP|High: £2,806 GBP|Avg: £1,214 GBP|-0.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
November 5, 2026
Retailer 3£637 GBP
Retailer 7£713 GBP
Retailer 4£728 GBP
Retailer 5£740 GBP
Retailer 8£869 GBP
Retailer 9£1,134 GBP
Retailer 6£1,190 GBP
Retailer 2£1,701 GBP
MOH London£2,766 GBP

12 data points across 9 retailers

11 retailers£637 GBP to £2,766 GBP

A
Cheapest Retailer
-
£637 GBP
B+
Retailer 2
-
£694 GBP
View
B+
Retailer 3
-
£713 GBP
View
Final sale: no returns
B+
Retailer 4
-
£728 GBP
View
Retailer 5
-
£740 GBP
View
Price last confirmed 25 days ago
B+
Retailer 6
-
£740 GBP
View
B+
Retailer 7
-
£869 GBP
View
B
Retailer 8
-
£1,190 GBP
View
B
Retailer 9
-
£1,701 GBP
View
B
Retailer 10
-
£2,080 GBP
View
Most Expensive
B
MOH London
LG499105136 · Nov 5
£2,766 GBP
View
10 more retailers have this diamond
Prices start from £637 GBPSave up to £2,128 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 Round
£637 GBP