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3.09ct E SI1 Round Lab Grown Diamond

ID • E/SI1 • IGI LG677505446

Shape and cutting style on the report: Round brilliant

Certificate IGI LG677505446

Diamond specifications and retailer prices

From £299 GBP
As of November 4, 2026
Save £1,060 GBP (78%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: £1,359 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 E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG677505446 or 677505446. Listed at 4 retailers as of November 4, 2026, with prices from £299 to £1,359, a £1,060 spread on the same certified stone. The Diamond Guys lists it at £1,359. 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 angle33.7°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG677505446
Dimensions9.46 × 9.39 × 5.66 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Top View
9.46 mm9.39 mm3.09 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG677505446
Side View
Table 59.0%Crown 33.7°Girdle: MediumPavilion 40.8°Culet: NoneDepth 60.1%

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: £299 GBP|Low: £291 GBP|High: £2,125 GBP|Avg: £815 GBP|-2.0%
Retailer 1
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
The Diamond Guys
October 27, 2026
Retailer 1£299 GBP
Retailer 12£333 GBP
Retailer 14£337 GBP
Retailer 8£449 GBP
Retailer 13£521 GBP
Retailer 10£551 GBP
Retailer 7£577 GBP
Retailer 2£715 GBP
Retailer 11£717 GBP
Retailer 3£844 GBP
Retailer 9£906 GBP
Retailer 4£1,027 GBP
The Diamond Guys£1,359 GBP
Retailer 6£1,461 GBP
Retailer 5£2,125 GBP

5 data points across 15 retailers

4 retailers£299 GBP to £1,359 GBP

A
Cheapest Retailer
-
£299 GBP
Final sale: no returns
Retailer 2
-
£333 GBP
View
Price last confirmed 52 days ago
B
Retailer 3
-
£1,027 GBP
View
Most Expensive
B
The Diamond Guys
1951064792 · Nov 6
£1,359 GBP
$1,829 USD
View
3 more retailers have this diamond
Prices start from £299 GBPSave up to £1,060 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
£299 GBP