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Heart|Lab Grown|IGI

1.21ct D IF Heart Lab Grown Diamond

VG • D/IF • IGI LG836619501

Shape and cutting style on the report: Heart brilliant

Certificate IGI LG836619501

Diamond specifications and retailer prices

From £183 GBP
As of November 4, 2026
Save £1,291 GBP (88%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £1,474 GBP at Brilliant Earth · As of November 4, 2026
View at Brilliant Earth

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 LG836619501 or 836619501. Listed at 20 retailers as of November 4, 2026, with prices from £183 to £1,474, a £1,291 spread on the same certified stone. Brilliant Earth lists it at £1,474. 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 angle34.9°
Pavilion angle37.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG836619501
Dimensions6.64 × 7.31 × 4.24 mm
L/W Ratio1.10
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
6.64 mm7.31 mm1.21 ctD / IF
OriginLab Grown
CutVery Good
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG836619501
Side View
Table 54.0%Crown 34.9°Girdle: STK-THKPavilion 37.7°Culet: NoneDepth 58.0%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 4
Current: £1,474 GBP|Low: £183 GBP|High: £1,474 GBP|Avg: £525 GBP
Brilliant Earth
Retailer 2
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November 5, 2026
Retailer 8£183 GBP
Retailer 4£205 GBP
Retailer 20£213 GBP
Retailer 7£227 GBP
Retailer 11£227 GBP
Retailer 15£233 GBP
Retailer 14£359 GBP
Retailer 6£381 GBP
Retailer 19£389 GBP
Retailer 18£392 GBP
Retailer 5£403 GBP
Retailer 2£427 GBP
Retailer 16£556 GBP
Retailer 9£569 GBP
Retailer 17£578 GBP
Retailer 12£730 GBP
Retailer 3£758 GBP
Retailer 10£768 GBP
Retailer 21£827 GBP
Retailer 13£907 GBP
Brilliant Earth£1,474 GBP

31 data points across 21 retailers

20 retailers£183 GBP to £1,474 GBP

A
Cheapest Retailer
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£183 GBP
A
Retailer 2
-
£205 GBP
View
Final sale: no returns
A
Retailer 3
-
£213 GBP
View
A
Retailer 4
-
£227 GBP
View
Retailer 5
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£227 GBP
View
Price last confirmed 11 days ago
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Retailer 6
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£233 GBP
View
A
Retailer 7
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£381 GBP
View
A
Retailer 8
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£389 GBP
View
A
Retailer 9
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£392 GBP
View
A
Retailer 10
-
£403 GBP
View
A
Retailer 11
-
£427 GBP
View
B+
Retailer 12
-
£556 GBP
View
B+
Retailer 13
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£569 GBP
View
B+
Retailer 14
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£578 GBP
View
B+
Retailer 15
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£730 GBP
View
B+
Retailer 16
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£758 GBP
View
B+
Retailer 17
-
£768 GBP
View
B+
Retailer 18
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£827 GBP
View
B
Retailer 19
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£907 GBP
View
Most Expensive
B
Brilliant Earth
21695593A · Nov 4
£1,474 GBP
$1,990 USD
View
19 more retailers have this diamond
Prices start from £183 GBPSave up to £1,291 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
£183 GBP