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Round|Lab Grown|IGI

1.25ct F SI1 Round Lab Grown Diamond

ID • F/SI1 • IGI LG749574687

Shape and cutting style on the report: Round brilliant

Certificate IGI LG749574687

Diamond specifications and retailer prices

From £259 GBP
As of November 6, 2026
Save £438 GBP (63%) vs most expensive(unlock to see where)
8 retailers carry this diamond
Most expensive: £696 GBP at MOH London · As of November 4, 2026
View at MOH London

About this 1.25ct lab-grown round diamond

This 1.25ct lab-grown round sits in the one-and-a-quarter to one-and-a-half carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG749574687 or 749574687. Listed at 8 retailers as of November 4, 2026, with prices from £259 to £696, a £438 spread on the same certified stone. MOH London lists it at £696. 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

1.25
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.6°
Pavilion angle40.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG749574687
Dimensions6.91 × 6.87 × 4.21 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
6.91 mm6.87 mm1.25 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG749574687
Side View
Table 59.0%Crown 35.6°Girdle: MED-STKPavilion 40.6°Culet: NoneDepth 61.2%

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 6
Current: £696 GBP|Low: £243 GBP|High: £702 GBP|Avg: £374 GBP|-0.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 6, 2026
Retailer 2£259 GBP
Retailer 3£260 GBP
Retailer 8£270 GBP
Retailer 5£290 GBP
Retailer 4£364 GBP
Retailer 7£392 GBP
Retailer 6£520 GBP
MOH London£696 GBP

42 data points across 8 retailers

8 retailers£259 GBP to £696 GBP

A
Cheapest Retailer
-
£259 GBP
A
Retailer 2
-
£260 GBP
View
B+
Retailer 3
-
£270 GBP
View
A
Retailer 4
-
£290 GBP
View
B+
Retailer 5
-
£364 GBP
View
B+
Retailer 6
-
£392 GBP
View
B
Retailer 7
-
£520 GBP
View
Most Expensive
B
MOH London
LG749574687 · Nov 4
£696 GBP
View
7 more retailers have this diamond
Prices start from £259 GBPSave up to £438 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
1.25ct Round
£259 GBP