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Round|Lab Grown|IGI

3.11ct F SI1 Round Lab Grown Diamond

ID • F/SI1 • IGI LG706512306

Shape and cutting style on the report: Round brilliant

Certificate IGI LG706512306

Diamond specifications and retailer prices

From £296 GBP
As of November 5, 2026
Save £1,316 GBP (82%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £1,612 GBP at Brilliant Earth · As of November 5, 2026
View at Brilliant Earth

About this 3.11ct lab-grown round diamond

This 3.11ct lab-grown round sits in the three to five carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG706512306 or 706512306. Listed at 16 retailers as of November 5, 2026, with prices from £296 to £1,612, a £1,316 spread on the same certified stone. Brilliant Earth lists it at £1,612. 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

3.11
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.6°
Pavilion angle41°
OriginLab Grown
Grading LabIGI
CertificateIGI LG706512306
Dimensions9.32 × 9.34 × 5.79 mm
L/W Ratio1.00
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
9.32 mm9.34 mm3.11 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG706512306
Side View
Table 57.0%Crown 34.6°Girdle: MediumPavilion 41°Culet: NoneDepth 62.1%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 5
Current: £1,612 GBP|Low: £278 GBP|High: £1,612 GBP|Avg: £715 GBP
Brilliant Earth
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
November 6, 2026
Retailer 13£296 GBP
Retailer 6£332 GBP
Retailer 7£368 GBP
Retailer 15£368 GBP
Retailer 10£476 GBP
Retailer 8£508 GBP
Retailer 2£574 GBP
Retailer 14£583 GBP
Retailer 9£592 GBP
Retailer 3£651 GBP
Retailer 5£739 GBP
Retailer 11£893 GBP
Retailer 4£1,181 GBP
Retailer 12£1,435 GBP
Brilliant Earth£1,612 GBP

37 data points across 15 retailers

16 retailers£296 GBP to £1,612 GBP

A
Cheapest Retailer
-
£296 GBP
A
Retailer 2
-
£332 GBP
View
Retailer 3
-
£368 GBP
View
Price last confirmed 12 days ago
A
Retailer 4
-
£368 GBP
View
A
Retailer 5
-
£476 GBP
View
A
Retailer 6
-
£508 GBP
View
A
Retailer 7
-
£574 GBP
View
B+
Retailer 8
-
£583 GBP
View
A
Retailer 9
-
£592 GBP
View
A
Retailer 10
-
£651 GBP
View
B+
Retailer 11
-
£739 GBP
View
B+
Retailer 12
-
£893 GBP
View
B
Retailer 13
-
£1,181 GBP
View
Retailer 14
-
£1,393 GBP
View
Price last confirmed 40 days ago
B
Retailer 15
-
£1,435 GBP
View
Most Expensive
B
Brilliant Earth
18656417A · Nov 5
£1,612 GBP
$2,170 USD
View
15 more retailers have this diamond
Prices start from £296 GBPSave up to £1,316 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
3.11ct Round
£296 GBP