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Round|Lab Grown|IGI

1.29ct H VS1 Round Lab Grown Diamond

ID • H/VS1 • IGI LG818686571

Shape and cutting style on the report: Round brilliant

Certificate IGI LG818686571

Diamond specifications and retailer prices

From £158 GBP
As of November 3, 2026
Save £568 GBP (78%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £788 GBP at MOH London · As of October 29, 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 H colour (near-colourless) and VS1 clarity (very-slightly-included), with a top-tier cut grade and certified by IGI LG818686571 or 818686571. Listed at 16 retailers as of November 3, 2026, with a 360% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.29
Carat
H
Colour
VS1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.6°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG818686571
Dimensions7.04 × 7.00 × 4.26 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
7.04 mm7.00 mm1.29 ctH / VS1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG818686571
Side View
Table 59.0%Crown 33.6°Girdle: MED-STKPavilion 40.9°Culet: NoneDepth 60.7%

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 3
Current: £788 GBP|Low: £158 GBP|High: £794 GBP|Avg: £454 GBP|-0.6%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
November 4, 2026
Retailer 11£158 GBP
Retailer 12£196 GBP
Retailer 13£336 GBP
Retailer 9£338 GBP
Retailer 5£342 GBP
Retailer 6£356 GBP
Retailer 2£385 GBP
Retailer 10£474 GBP
Retailer 7£479 GBP
Retailer 8£513 GBP
Retailer 4£668 GBP
Retailer 3£711 GBP
MOH London£788 GBP

28 data points across 13 retailers

16 retailers£158 GBP to £726 GBP

A
Cheapest Retailer
-
£158 GBP
A
Retailer 2
-
£183 GBP
View
A
Retailer 3
-
£196 GBP
View
Retailer 4
-
£196 GBP
View
Price last confirmed 11 days ago
A
Retailer 5
-
£336 GBP
View
A
Retailer 6
-
£338 GBP
View
A
Retailer 7
-
£342 GBP
View
A
Retailer 8
-
£356 GBP
View
A
Retailer 9
-
£385 GBP
View
B+
Retailer 10
-
£474 GBP
View
A
Retailer 11
-
£479 GBP
View
B+
Retailer 12
-
£513 GBP
View
B+
Retailer 13
-
£629 GBP
View
B+
Retailer 14
-
£668 GBP
View
B+
Retailer 15
-
£726 GBP
View
Most Expensive
MOH London
LG818686571 · Oct 29
£788 GBP
View
Price last confirmed 7 days ago
15 more retailers have this diamond
Prices start from £158 GBPSave up to £568 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
£158 GBP