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Round|Lab Grown|IGI

3.09ct E SI1 Round Lab Grown Diamond

ID • E/SI1 • IGI LG655428249

Shape and cutting style on the report: Round brilliant

Certificate IGI LG655428249

Diamond specifications and retailer prices

From £351 GBP
As of November 4, 2026
Save £967 GBP (73%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: £1,319 GBP at Rare Carat · As of November 4, 2026
View at Rare Carat

About this 3.09ct lab-grown round diamond

This 3.09ct lab-grown round sits in the three to five carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG655428249 or 655428249. Listed at 7 retailers as of November 4, 2026, with prices from £351 to £1,319, a £967 spread on the same certified stone. Rare Carat lists it at £1,319. 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
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG655428249
Dimensions9.36 × 9.40 × 5.74 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
9.36 mm9.40 mm3.09 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG655428249
Side View
Table 58.0%Crown 35°Girdle: MediumPavilion 40.8°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 4
Current: £1,319 GBP|Low: £351 GBP|High: £3,159 GBP|Avg: £1,085 GBP|-22.9%
Rare Carat
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 5, 2026
Retailer 5£351 GBP
Retailer 4£506 GBP
Retailer 7£508 GBP
Retailer 3£559 GBP
Retailer 6£709 GBP
Retailer 2£1,259 GBP
Rare Carat£1,319 GBP
Retailer 8£3,159 GBP

9 data points across 8 retailers

7 retailers£351 GBP to £1,319 GBP

A
Cheapest Retailer
-
£351 GBP
Retailer 2
-
£506 GBP
View
Price last confirmed 8 days ago
B+
Retailer 3
-
£508 GBP
View
A
Retailer 4
-
£559 GBP
View
A
Retailer 5
-
£709 GBP
View
B
Retailer 6
-
£1,259 GBP
View
Most Expensive
B
Rare Carat
KI2494282KF655 · Nov 4
£1,319 GBP
$1,775 USD
View
6 more retailers have this diamond
Prices start from £351 GBPSave up to £967 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
3.09ct Round
£351 GBP