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1.29ct D SI1 Round Lab Grown Diamond

EX • D/SI1 • IGI LG766644317

Shape and cutting style on the report: Round brilliant

Certificate IGI LG766644317

Diamond specifications and retailer prices

From £274 GBP
As of November 3, 2026
Save £480 GBP (64%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: £754 GBP at MOH London · As of November 2, 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 D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG766644317 or 766644317. Listed at 10 retailers as of November 2, 2026, with prices from £274 to £754, a £480 spread on the same certified stone. MOH London lists it at £754. 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
D
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.4°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG766644317
Dimensions6.94 × 6.89 × 4.35 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
6.94 mm6.89 mm1.29 ctD / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG766644317
Side View
Table 57.0%Crown 36.4°Girdle: THN-STKPavilion 40.8°Culet: NoneDepth 62.9%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 3
Current: £754 GBP|Low: £80 GBP|High: £776 GBP|Avg: £346 GBP|-2.8%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 4, 2026
Retailer 3£80 GBP
Retailer 7£161 GBP
Retailer 4£274 GBP
Retailer 9£287 GBP
Retailer 6£288 GBP
Retailer 10£314 GBP
Retailer 8£348 GBP
Retailer 2£360 GBP
Retailer 5£424 GBP
Retailer 11£461 GBP
MOH London£754 GBP

34 data points across 11 retailers

10 retailers£274 GBP to £754 GBP

Retailer 1
-
£161 GBP
Price last confirmed 12 days ago
A
Retailer 2
-
£274 GBP
View
B+
Retailer 3
-
£287 GBP
View
A
Retailer 4
-
£288 GBP
View
A
Retailer 5
-
£314 GBP
View
B+
Retailer 6
-
£348 GBP
View
B+
Retailer 7
-
£360 GBP
View
B
Retailer 8
-
£424 GBP
View
B
Retailer 9
-
£461 GBP
View
Most Expensive
B
MOH London
LG766644317 · Nov 2
£754 GBP
View
9 more retailers have this diamond
Prices start from £274 GBPSave up to £480 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
£274 GBP