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Round|Lab Grown|IGI

1.29ct D SI1 Round Lab Grown Diamond

ID • D/SI1 • IGI LG800683786

Shape and cutting style on the report: Round brilliant

Certificate IGI LG800683786

Diamond specifications and retailer prices

From £132 GBP
As of November 1, 2026
Save £635 GBP (83%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £767 GBP at MOH London · As of November 1, 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 LG800683786 or 800683786. Listed at 14 retailers as of November 1, 2026, with prices from £132 to £767, a £635 spread on the same certified stone. MOH London lists it at £767. 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
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.2°
Pavilion angle40.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG800683786
Dimensions6.98 × 6.92 × 4.28 mm
L/W Ratio1.01
Girdle conditionFaceted
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
6.98 mm6.92 mm1.29 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG800683786
Side View
Table 57.0%Crown 35.2°Girdle: Slightly ThickPavilion 40.3°Culet: NoneDepth 61.7%

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 1
Current: £767 GBP|Low: £126 GBP|High: £776 GBP|Avg: £317 GBP|-1.1%
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
Retailer 14
November 4, 2026
Retailer 11£132 GBP
Retailer 12£148 GBP
Retailer 6£160 GBP
Retailer 5£164 GBP
Retailer 8£278 GBP
Retailer 4£291 GBP
Retailer 10£293 GBP
Retailer 3£314 GBP
Retailer 9£324 GBP
Retailer 14£351 GBP
Retailer 2£360 GBP
Retailer 7£434 GBP
Retailer 13£461 GBP
MOH London£767 GBP

34 data points across 14 retailers

14 retailers£132 GBP to £767 GBP

A
Cheapest Retailer
-
£132 GBP
A
Retailer 2
-
£148 GBP
View
Final sale: no returns
Retailer 3
-
£160 GBP
View
Price last confirmed 52 days ago
Retailer 4
-
£164 GBP
View
Price last confirmed 12 days ago
A
Retailer 5
-
£278 GBP
View
A
Retailer 6
-
£291 GBP
View
A
Retailer 7
-
£293 GBP
View
A
Retailer 8
-
£314 GBP
View
A
Retailer 9
-
£324 GBP
View
B+
Retailer 10
-
£351 GBP
View
B+
Retailer 11
-
£360 GBP
View
B+
Retailer 12
-
£434 GBP
View
B
Retailer 13
-
£461 GBP
View
Most Expensive
B
MOH London
LG800683786 · Nov 1
£767 GBP
View
13 more retailers have this diamond
Prices start from £132 GBPSave up to £635 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
£132 GBP