CaratHunter
Plans
Heart|Lab Grown|IGI

1.50ct F SI1 Heart Lab Grown Diamond

ID • F/SI1 • IGI LG636479171

Shape and cutting style on the report: Heart brilliant

Certificate IGI LG636479171

Diamond specifications and retailer prices

From £154 GBP
As of November 6, 2026
Save £498 GBP (76%) vs most expensive(unlock to see where)
14 retailers carry this diamond
Most expensive: £1,240 GBP at Brilliant Earth · As of October 18, 2026
View at Brilliant Earth

About this 1.5ct lab-grown heart diamond

This 1.5ct lab-grown heart sits in the one-and-a-half to two carat band, graded F colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG636479171 or 636479171. Listed at 14 retailers as of November 6, 2026, with a 324% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

1.50
Carat
F
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle31.1°
Pavilion angle38.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG636479171
Dimensions7.17 × 8.05 × 4.54 mm
L/W Ratio1.12
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
7.17 mm8.05 mm1.50 ctF / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG636479171
Side View
Table 62.0%Crown 31.1°Girdle: STK-THKPavilion 38.1°Culet: NoneDepth 56.4%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 6
Current: £1,240 GBP|Low: £148 GBP|High: £1,240 GBP|Avg: £428 GBP
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 6, 2026
Retailer 4£154 GBP
Retailer 6£179 GBP
Retailer 8£191 GBP
Retailer 11£191 GBP
Retailer 5£242 GBP
Retailer 3£330 GBP
Retailer 7£346 GBP
Retailer 2£613 GBP
Retailer 10£615 GBP
Retailer 9£895 GBP
Brilliant Earth£1,240 GBP

41 data points across 11 retailers

14 retailers£154 GBP to £652 GBP

A
Cheapest Retailer
-
£154 GBP
A
Retailer 2
-
£179 GBP
View
A
Retailer 3
-
£191 GBP
View
Retailer 4
-
£191 GBP
View
Price last confirmed 13 days ago
A
Retailer 5
-
£242 GBP
View
B+
Retailer 6
-
£330 GBP
View
B+
Retailer 7
-
£344 GBP
View
A
Retailer 8
-
£346 GBP
View
B+
Retailer 9
-
£381 GBP
View
B
Retailer 10
-
£613 GBP
View
B
Retailer 11
-
£615 GBP
View
B
Retailer 12
-
£652 GBP
View
Retailer 13
-
£895 GBP
View
Price last confirmed 9 days ago
Most Expensive
Brilliant Earth
15813751A · Oct 18
£1,240 GBP
$1,660 USD
View
Price last confirmed 19 days ago
13 more retailers have this diamond
Prices start from £154 GBPSave up to £498 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
1.50ct Heart
£154 GBP