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Round|Lab Grown|IGI

3.09ct F SI1 Round Lab Grown Diamond

EX • F/SI1 • IGI LG629470448

Shape and cutting style on the report: Round brilliant

Certificate IGI LG629470448

Diamond specifications and retailer prices

From £929 GBP
As of November 5, 2026
Save £301 GBP (24%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: £1,230 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 LG629470448 or 629470448. Listed at 3 retailers as of November 5, 2026, with prices from £929 to £1,230, a £301 spread on the same certified stone. The Diamond Guys lists it at £1,230. 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 angle36°
Pavilion angle41.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG629470448
Dimensions9.26 × 9.19 × 5.84 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
9.26 mm9.19 mm3.09 ctF / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG629470448
Side View
Table 58.0%Crown 36°Girdle: MED-STKPavilion 41.5°Culet: NoneDepth 63.4%

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: £250 GBP|Low: £186 GBP|High: £3,128 GBP|Avg: £1,096 GBP
Retailer 1
Retailer 2
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Retailer 5
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Retailer 8
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Retailer 11
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Retailer 15
The Diamond Guys
September 18, 2026
Retailer 1£250 GBP
Retailer 13£286 GBP
Retailer 8£290 GBP
Retailer 11£402 GBP
Retailer 12£453 GBP
Retailer 9£490 GBP
Retailer 10£510 GBP
Retailer 15£710 GBP
Retailer 14£710 GBP
Retailer 2£773 GBP
Retailer 3£784 GBP
Retailer 4£929 GBP
The Diamond Guys£1,230 GBP
Retailer 6£1,404 GBP
Retailer 5£1,961 GBP
Retailer 7£3,128 GBP

65 data points across 16 retailers

3 retailers£929 GBP to £1,230 GBP

Retailer 1
-
£286 GBP
Price last confirmed 51 days ago
B+
Retailer 2
-
£929 GBP
View
Most Expensive
B
The Diamond Guys
1954434405 · Nov 6
£1,230 GBP
$1,656 USD
View
2 more retailers have this diamond
Prices start from £929 GBPSave up to £301 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
£929 GBP