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Heart|Lab Grown|IGI

1.51ct D SI1 Heart Lab Grown Diamond

EX • D/SI1 • IGI LG650418911

Shape and cutting style on the report: Heart brilliant

Certificate IGI LG650418911

Diamond specifications and retailer prices

From £161 GBP
As of November 6, 2026
Save £766 GBP (83%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £926 GBP at Brilliant Earth · As of November 6, 2026
View at Brilliant Earth

About this 1.51ct lab-grown heart diamond

This 1.51ct lab-grown heart sits in the one-and-a-half to two carat band, graded D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG650418911 or 650418911. Listed at 14 retailers as of November 6, 2026, with prices from £161 to £926, a £766 spread on the same certified stone. Brilliant Earth lists it at £926. 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

1.51
Carat
D
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.1°
Pavilion angle39°
OriginLab Grown
Grading LabIGI
CertificateIGI LG650418911
Dimensions6.97 × 8.10 × 4.63 mm
L/W Ratio1.16
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
6.97 mm8.10 mm1.51 ctD / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG650418911
Side View
Table 56.0%Crown 33.1°Girdle: MED-STKPavilion 39°Culet: NoneDepth 57.2%

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 6
Current: £926 GBP|Low: £159 GBP|High: £1,494 GBP|Avg: £476 GBP|-38.0%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 6, 2026
Retailer 4£161 GBP
Retailer 10£180 GBP
Retailer 12£186 GBP
Retailer 7£199 GBP
Retailer 11£269 GBP
Retailer 2£365 GBP
Retailer 3£371 GBP
Retailer 8£389 GBP
Retailer 9£640 GBP
Retailer 5£643 GBP
Retailer 6£798 GBP
Brilliant Earth£926 GBP

45 data points across 12 retailers

14 retailers£161 GBP to £926 GBP

A
Cheapest Retailer
-
£161 GBP
A
Retailer 2
-
£180 GBP
View
Final sale: no returns
A
Retailer 3
-
£186 GBP
View
A
Retailer 4
-
£199 GBP
View
Retailer 5
-
£205 GBP
View
Price last confirmed 12 days ago
B+
Retailer 6
-
£269 GBP
View
B+
Retailer 7
-
£365 GBP
View
B+
Retailer 8
-
£371 GBP
View
B+
Retailer 9
-
£389 GBP
View
B+
Retailer 10
-
£522 GBP
View
B
Retailer 11
-
£640 GBP
View
B
Retailer 12
-
£643 GBP
View
B
Retailer 13
-
£798 GBP
View
Most Expensive
B
Brilliant Earth
12166023A · Nov 6
£926 GBP
$1,240 USD
View
13 more retailers have this diamond
Prices start from £161 GBPSave up to £766 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
1.51ct Heart
£161 GBP