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Heart|Lab Grown|IGI

1.21ct D IF Heart Lab Grown Diamond

VG • D/IF • IGI LG852651628

Shape and cutting style on the report: Heart brilliant

Certificate IGI LG852651628

Diamond specifications and retailer prices

From £493 GBP
As of November 1, 2026
Save £648 GBP (57%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: £1,141 GBP at MOH London · As of November 5, 2026
View at MOH London

About this 1.21ct lab-grown heart diamond

This 1.21ct lab-grown heart sits in the classic one-carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless), with a very-good cut grade and certified by IGI LG852651628 or 852651628. Listed at 5 retailers as of November 1, 2026, with prices from £493 to £1,141, a £648 spread on the same certified stone. MOH London lists it at £1,141. Cut grade matters more than carat or clarity for visible brilliance. If you can shift budget toward an Excellent or Ideal cut, do it before chasing higher colour or clarity.

The 4Cs

1.21
Carat
D
Colour
IF
Clarity
Very Good
Cut

Specifications

CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle39.9°
Pavilion angle38.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG852651628
Dimensions6.39 × 7.41 × 4.29 mm
L/W Ratio1.16
Girdle conditionFaceted
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
6.39 mm7.41 mm1.21 ctD / IF
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG852651628
Side View
Table 65.0%Crown 39.9°Girdle: MED-THKPavilion 38.5°Culet: NoneDepth 57.9%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 1
Current: £1,141 GBP|Low: £493 GBP|High: £1,224 GBP|Avg: £758 GBP|-6.8%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
November 5, 2026
Retailer 4£493 GBP
Retailer 2£503 GBP
Retailer 5£590 GBP
Retailer 3£952 GBP
MOH London£1,141 GBP

6 data points across 5 retailers

5 retailers£493 GBP to £1,141 GBP

B+
Cheapest Retailer
-
£493 GBP
A
Retailer 2
-
£503 GBP
View
B+
Retailer 3
-
£590 GBP
View
B
Retailer 4
-
£952 GBP
View
Most Expensive
B
MOH London
LG852651628 · Nov 5
£1,141 GBP
View
4 more retailers have this diamond
Prices start from £493 GBPSave up to £648 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
1.21ct Heart
£493 GBP