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Heart|Lab Grown|IGI

1.09ct E SI1 Heart Lab Grown Diamond

EX • E/SI1 • IGI LG839615483

Shape and cutting style on the report: Heart brilliant

Certificate IGI LG839615483

Diamond specifications and retailer prices

From £128 GBP
As of November 6, 2026
Save £328 GBP (72%) vs most expensive(unlock to see where)
3 retailers carry this diamond
Most expensive: £456 GBP at Brilliant Earth · As of November 6, 2026
View at Brilliant Earth

About this 1.09ct lab-grown heart diamond

This 1.09ct lab-grown heart sits in the classic one-carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG839615483 or 839615483. Listed at 3 retailers as of November 6, 2026, with prices from £128 to £456, a £328 spread on the same certified stone. Brilliant Earth lists it at £456. 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

1.09
Carat
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.1°
Pavilion angle40.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG839615483
Dimensions6.27 × 7.13 × 4.24 mm
L/W Ratio1.14
Girdle conditionFaceted
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
6.27 mm7.13 mm1.09 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG839615483
Side View
Table 61.0%Crown 35.1°Girdle: MED-STKPavilion 40.2°Culet: NoneDepth 59.5%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 6
Current: £456 GBP|Low: £128 GBP|High: £717 GBP|Avg: £393 GBP|-36.5%
Brilliant Earth
Retailer 2
Retailer 3
November 6, 2026
Retailer 3£128 GBP
Retailer 2£256 GBP
Brilliant Earth£456 GBP

34 data points across 3 retailers

3 retailers£128 GBP to £456 GBP

A
Cheapest Retailer
-
£128 GBP
Final sale: no returns
B+
Retailer 2
-
£256 GBP
View
Most Expensive
B
Brilliant Earth
21583444A · Nov 6
£456 GBP
$610 USD
View
2 more retailers have this diamond
Prices start from £128 GBPSave up to £328 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
1.09ct Heart
£128 GBP