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Round|Lab Grown|IGI

3.09ct F SI1 Round Lab Grown Diamond

ID • F/SI1 • IGI LG621433896

Shape and cutting style on the report: Round brilliant

Certificate IGI LG621433896

Diamond specifications and retailer prices

From £916 GBP
As of November 5, 2026
Save £296 GBP (24%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: £1,213 GBP at The Diamond Guys · As of November 6, 2026
View at The Diamond Guys

About this 3.09ct lab-grown round diamond

This 3.09ct 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 LG621433896 or 621433896. Listed at 2 retailers as of November 5, 2026, with prices from £916 to £1,213, a £296 spread on the same certified stone. The Diamond Guys lists it at £1,213. 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

3.09
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.8°
Pavilion angle41.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG621433896
Dimensions9.37 × 9.31 × 5.80 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
9.37 mm9.31 mm3.09 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG621433896
Side View
Table 58.0%Crown 34.8°Girdle: MED-STKPavilion 41.3°Culet: NoneDepth 62.0%

Caratlytics Score

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B+
Very Good
Strong quality and value balance
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Price History

Last verified: Nov 5
Current: £246 GBP|Low: £181 GBP|High: £2,036 GBP|Avg: £901 GBP|+31.3%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
The Diamond Guys
September 18, 2026
Retailer 1£246 GBP
Retailer 5£445 GBP
Retailer 3£481 GBP
Retailer 4£505 GBP
Retailer 6£709 GBP
Retailer 8£710 GBP
Retailer 9£771 GBP
Retailer 7£790 GBP
Retailer 10£916 GBP
The Diamond Guys£1,213 GBP
Retailer 2£1,932 GBP

72 data points across 11 retailers

2 retailers£916 GBP to £1,213 GBP

B+
Cheapest Retailer
-
£916 GBP
Most Expensive
B
The Diamond Guys
1954434402 · Nov 6
£1,213 GBP
$1,632 USD
View
1 more retailer has this diamond
Prices start from £916 GBPSave up to £296 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.

B+
3.09ct Round
£916 GBP