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Round|Lab Grown|IGI

1.24ct D SI1 Round Lab Grown Diamond

EX • D/SI1 • IGI LG799670980

Shape and cutting style on the report: Round brilliant

Certificate IGI LG799670980

Diamond specifications and retailer prices

From £126 GBP
As of November 1, 2026
Save £607 GBP (83%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £733 GBP at MOH London · As of November 2, 2026
View at MOH London

About this 1.24ct lab-grown round diamond

This 1.24ct lab-grown round sits in the classic one-carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG799670980 or 799670980. Listed at 12 retailers as of November 1, 2026, with prices from £126 to £733, a £607 spread on the same certified stone. MOH London lists it at £733. 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

1.24
Carat
D
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle35.2°
Pavilion angle40.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG799670980
Dimensions6.82 × 6.78 × 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
6.82 mm6.78 mm1.24 ctD / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateIGI LG799670980
Side View
Table 54.0%Crown 35.2°Girdle: MED-STKPavilion 40.5°Culet: NoneDepth 62.9%

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 1
Current: £733 GBP|Low: £79 GBP|High: £743 GBP|Avg: £298 GBP|-1.3%
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 5£79 GBP
Retailer 9£126 GBP
Retailer 10£142 GBP
Retailer 4£157 GBP
Retailer 6£267 GBP
Retailer 7£279 GBP
Retailer 3£280 GBP
Retailer 13£293 GBP
Retailer 12£343 GBP
Retailer 2£360 GBP
Retailer 8£407 GBP
Retailer 11£438 GBP
MOH London£733 GBP

36 data points across 13 retailers

12 retailers£126 GBP to £733 GBP

A
Cheapest Retailer
-
£126 GBP
A
Retailer 2
-
£142 GBP
View
Final sale: no returns
Retailer 3
-
£157 GBP
View
Price last confirmed 12 days ago
A
Retailer 4
-
£267 GBP
View
A
Retailer 5
-
£279 GBP
View
A
Retailer 6
-
£280 GBP
View
B+
Retailer 7
-
£293 GBP
View
B+
Retailer 8
-
£343 GBP
View
B+
Retailer 9
-
£360 GBP
View
B
Retailer 10
-
£407 GBP
View
B+
Retailer 11
-
£438 GBP
View
Most Expensive
B
MOH London
LG799670980 · Nov 2
£733 GBP
View
11 more retailers have this diamond
Prices start from £126 GBPSave up to £607 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
1.24ct Round
£126 GBP