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Round|Lab Grown|IGI

1.51ct F SI1 Round Lab Grown Diamond

EX • F/SI1 • IGI LG794609571

Shape and cutting style on the report: Round brilliant

Certificate IGI LG794609571

Diamond specifications and retailer prices

From £143 GBP
As of November 5, 2026
Save £687 GBP (83%) vs most expensive(unlock to see where)
17 retailers carry this diamond
Most expensive: £830 GBP at MOH London · As of November 5, 2026
View at MOH London

About this 1.51ct lab-grown round diamond

This 1.51ct lab-grown round sits in the one-and-a-half to two carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG794609571 or 794609571. Listed at 17 retailers as of November 5, 2026, with prices from £143 to £830, a £687 spread on the same certified stone. MOH London lists it at £830. 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

1.51
Carat
F
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34°
Pavilion angle40.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG794609571
Dimensions7.49 × 7.46 × 4.39 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.49 mm7.46 mm1.51 ctF / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG794609571
Side View
Table 63.0%Crown 34°Girdle: MediumPavilion 40.6°Culet: NoneDepth 58.8%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 5
Current: £830 GBP|Low: £143 GBP|High: £852 GBP|Avg: £387 GBP|-2.5%
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
Retailer 15
Retailer 16
November 6, 2026
Retailer 7£143 GBP
Retailer 3£160 GBP
Retailer 16£166 GBP
Retailer 12£178 GBP
Retailer 8£179 GBP
Retailer 4£311 GBP
Retailer 14£315 GBP
Retailer 10£320 GBP
Retailer 2£325 GBP
Retailer 15£425 GBP
Retailer 9£473 GBP
Retailer 11£528 GBP
Retailer 13£573 GBP
Retailer 5£579 GBP
Retailer 6£612 GBP
MOH London£830 GBP

30 data points across 16 retailers

17 retailers£143 GBP to £830 GBP

A
Cheapest Retailer
-
£143 GBP
A
Retailer 2
-
£160 GBP
View
Final sale: no returns
A
Retailer 3
-
£166 GBP
View
A
Retailer 4
-
£178 GBP
View
Retailer 5
-
£179 GBP
View
Price last confirmed 12 days ago
B+
Retailer 6
-
£311 GBP
View
A
Retailer 7
-
£315 GBP
View
A
Retailer 8
-
£320 GBP
View
A
Retailer 9
-
£325 GBP
View
B+
Retailer 10
-
£425 GBP
View
B+
Retailer 11
-
£473 GBP
View
B+
Retailer 12
-
£528 GBP
View
B
Retailer 13
-
£573 GBP
View
B
Retailer 14
-
£579 GBP
View
B+
Retailer 15
-
£612 GBP
View
B
Retailer 16
-
£654 GBP
View
Most Expensive
B
MOH London
LG794609571 · Nov 5
£830 GBP
View
16 more retailers have this diamond
Prices start from £143 GBPSave up to £687 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
1.51ct Round
£143 GBP