CaratHunter
Plans
Heart|Lab Grown|IGI

1.31ct F VS1 Heart Lab Grown Diamond

EX • F/VS1 • IGI LG728512322

Shape and cutting style on the report: Heart brilliant

Certificate IGI LG728512322

Diamond specifications and retailer prices

From £317 GBP
As of November 4, 2026
Save £310 GBP (49%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: £858 GBP at MOH London · As of October 21, 2026
View at MOH London

About this 1.31ct lab-grown heart diamond

This 1.31ct lab-grown heart sits in the one-and-a-quarter to one-and-a-half carat band, graded F colour (colourless) and VS1 clarity (very-slightly-included), with a top-tier cut grade and certified by IGI LG728512322 or 728512322. Listed at 5 retailers as of November 4, 2026, with a 98% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.31
Carat
F
Colour
VS1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.3°
Pavilion angle39.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG728512322
Dimensions6.28 × 7.46 × 4.56 mm
L/W Ratio1.19
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process Type IIa
Top View
6.28 mm7.46 mm1.31 ctF / VS1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG728512322
Side View
Table 57.0%Crown 36.3°Girdle: STK-VTKPavilion 39.9°Culet: NoneDepth 61.1%

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 4
Current: £858 GBP|Low: £310 GBP|High: £898 GBP|Avg: £484 GBP|-3.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
November 5, 2026
Retailer 6£317 GBP
Retailer 2£331 GBP
Retailer 4£368 GBP
Retailer 3£372 GBP
Retailer 5£626 GBP
MOH London£858 GBP

34 data points across 6 retailers

5 retailers£317 GBP to £626 GBP

A
Cheapest Retailer
-
£317 GBP
A
Retailer 2
-
£331 GBP
View
B+
Retailer 3
-
£372 GBP
View
B
Retailer 4
-
£626 GBP
View
Most Expensive
MOH London
LG728512322 · Oct 21
£858 GBP
View
Price last confirmed 15 days ago
4 more retailers have this diamond
Prices start from £317 GBPSave up to £310 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
1.31ct Heart
£317 GBP