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Round|Lab Grown|IGI

3.09ct F SI1 Round Lab Grown Diamond

EX • F/SI1 • IGI LG635499506

Shape and cutting style on the report: Round brilliant

Certificate IGI LG635499506

Diamond specifications and retailer prices

From £958 GBP
As of November 5, 2026
Save £310 GBP (24%) vs most expensive(unlock to see where)
2 retailers carry this diamond
Most expensive: £1,268 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 LG635499506 or 635499506. Listed at 2 retailers as of November 5, 2026, with prices from £958 to £1,268, a £310 spread on the same certified stone. The Diamond Guys lists it at £1,268. 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
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.6°
Pavilion angle40.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG635499506
Dimensions9.29 × 9.25 × 5.81 mm
L/W Ratio1.00
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
9.29 mm9.25 mm3.09 ctF / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG635499506
Side View
Table 55.0%Crown 35.6°Girdle: MED-STKPavilion 40.7°Culet: NoneDepth 62.6%

Caratlytics Score

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B
Good
Decent quality, room for better deals
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Price History

Last verified: Nov 5
Current: £253 GBP|Low: £188 GBP|High: £2,229 GBP|Avg: £926 GBP|+31.7%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
The Diamond Guys
September 18, 2026
Retailer 1£253 GBP
Retailer 6£456 GBP
Retailer 4£495 GBP
Retailer 5£513 GBP
Retailer 7£711 GBP
Retailer 9£713 GBP
Retailer 8£780 GBP
Retailer 10£790 GBP
Retailer 11£958 GBP
The Diamond Guys£1,268 GBP
Retailer 3£1,404 GBP
Retailer 2£1,984 GBP

74 data points across 12 retailers

2 retailers£958 GBP to £1,268 GBP

B
Cheapest Retailer
-
£958 GBP
Most Expensive
B
The Diamond Guys
1954434406 · Nov 6
£1,268 GBP
$1,706 USD
View
1 more retailer has this diamond
Prices start from £958 GBPSave up to £310 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
£958 GBP