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Round|Lab Grown|IGI

1.29ct G SI1 Round Lab Grown Diamond

ID • G/SI1 • IGI LG816613930

Shape and cutting style on the report: Round brilliant

Certificate IGI LG816613930

Diamond specifications and retailer prices

From £129 GBP
As of November 5, 2026
Save £619 GBP (83%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £748 GBP at MOH London · As of November 5, 2026
View at MOH London

About this 1.29ct lab-grown round diamond

This 1.29ct lab-grown round sits in the one-and-a-quarter to one-and-a-half carat band, graded G colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG816613930 or 816613930. Listed at 16 retailers as of November 5, 2026, with prices from £129 to £748, a £619 spread on the same certified stone. MOH London lists it at £748. 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

1.29
Carat
G
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.5°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG816613930
Dimensions7.00 × 6.95 × 4.27 mm
L/W Ratio1.01
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.00 mm6.95 mm1.29 ctG / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG816613930
Side View
Table 58.0%Crown 34.5°Girdle: MediumPavilion 40.8°Culet: NoneDepth 61.1%

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: Nov 5
Current: £748 GBP|Low: £129 GBP|High: £759 GBP|Avg: £353 GBP|-0.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 7£129 GBP
Retailer 9£160 GBP
Retailer 2£275 GBP
Retailer 4£283 GBP
Retailer 10£285 GBP
Retailer 5£319 GBP
Retailer 3£355 GBP
Retailer 6£409 GBP
Retailer 8£438 GBP
MOH London£748 GBP

45 data points across 10 retailers

16 retailers£129 GBP to £748 GBP

A
Cheapest Retailer
-
£129 GBP
A
Retailer 2
-
£150 GBP
View
Retailer 3
-
£160 GBP
View
Price last confirmed 12 days ago
A
Retailer 4
-
£160 GBP
View
A
Retailer 5
-
£275 GBP
View
A
Retailer 6
-
£283 GBP
View
B+
Retailer 7
-
£285 GBP
View
A
Retailer 8
-
£319 GBP
View
B+
Retailer 9
-
£343 GBP
View
A
Retailer 10
-
£355 GBP
View
B+
Retailer 11
-
£409 GBP
View
B+
Retailer 12
-
£438 GBP
View
B+
Retailer 13
-
£498 GBP
View
B
Retailer 14
-
£516 GBP
View
B+
Retailer 15
-
£556 GBP
View
Most Expensive
B
MOH London
LG816613930 · Nov 5
£748 GBP
View
15 more retailers have this diamond
Prices start from £129 GBPSave up to £619 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
1.29ct Round
£129 GBP