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Heart|Lab Grown|IGI

1.09ct E SI1 Heart Lab Grown Diamond

ID • E/SI1 • IGI LG831648664

Shape and cutting style on the report: Heart brilliant

Certificate IGI LG831648664

Diamond specifications and retailer prices

From £126 GBP
As of November 6, 2026
Save £591 GBP (82%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: £717 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 LG831648664 or 831648664. Listed at 15 retailers as of November 6, 2026, with prices from £126 to £717, a £591 spread on the same certified stone. Brilliant Earth lists it at £717. 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
Ideal
Cut

Specifications

CutIdeal
PolishVery Good
SymmetryVery Good
FluorescenceNone
Crown angle34.1°
Pavilion angle39.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG831648664
Dimensions7.44 × 6.51 × 4.05 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
7.44 mm6.51 mm1.09 ctE / SI1
OriginLab Grown
CutIdeal
PolishVery Good
SymmetryVery Good
FluorescenceNone
CertificateIGI LG831648664
Side View
Table 61.0%Crown 34.1°Girdle: MED-STKPavilion 39.7°Culet: NoneDepth 54.4%

Caratlytics Score

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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 6
Current: £717 GBP|Low: £126 GBP|High: £740 GBP|Avg: £364 GBP|-3.0%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 6, 2026
Retailer 5£126 GBP
Retailer 2£181 GBP
Retailer 3£241 GBP
Retailer 10£254 GBP
Retailer 7£257 GBP
Retailer 6£266 GBP
Retailer 8£366 GBP
Retailer 9£387 GBP
Retailer 4£654 GBP
Brilliant Earth£717 GBP

39 data points across 10 retailers

15 retailers£126 GBP to £717 GBP

Retailer 1
-
£114 GBP
Price last confirmed 20 days ago
A
Retailer 2
-
£126 GBP
View
Final sale: no returns
Retailer 3
-
£133 GBP
View
Price last confirmed 22 days ago
Retailer 4
-
£142 GBP
View
Price last confirmed 22 days ago
A
Retailer 5
-
£162 GBP
View
A
Retailer 6
-
£181 GBP
View
B+
Retailer 7
-
£241 GBP
View
Retailer 8
-
£254 GBP
View
Price last confirmed 12 days ago
B+
Retailer 9
-
£257 GBP
View
B+
Retailer 10
-
£266 GBP
View
B
Retailer 11
-
£366 GBP
View
B
Retailer 12
-
£387 GBP
View
Retailer 13
-
£456 GBP
View
Price last confirmed 21 days ago
B
Retailer 14
-
£654 GBP
View
Most Expensive
B
Brilliant Earth
21274495A · Nov 6
£717 GBP
$960 USD
View
14 more retailers have this diamond
Prices start from £126 GBPSave up to £591 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
£126 GBP