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Heart|Lab Grown|IGI

1.29ct D IF Heart Lab Grown Diamond

EX • D/IF • IGI LG839630399

Shape and cutting style on the report: Heart brilliant

Certificate IGI LG839630399

Diamond specifications and retailer prices

From £203 GBP
As of November 4, 2026
Save £2,079 GBP (91%) vs most expensive(unlock to see where)
20 retailers carry this diamond
Most expensive: £2,282 GBP at Brilliant Earth · As of October 30, 2026
View at Brilliant Earth

About this 1.29ct lab-grown heart diamond

This 1.29ct lab-grown heart sits in the one-and-a-quarter to one-and-a-half carat band, graded D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG839630399 or 839630399. Listed at 20 retailers as of October 30, 2026, with prices from £203 to £2,282, a £2,079 spread on the same certified stone. Brilliant Earth lists it at £2,282. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.29
Carat
D
Colour
IF
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.3°
Pavilion angle37.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG839630399
Dimensions6.87 × 7.52 × 4.13 mm
L/W Ratio1.09
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
6.87 mm7.52 mm1.29 ctD / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG839630399
Side View
Table 58.0%Crown 34.3°Girdle: THK-VTKPavilion 37.7°Culet: NoneDepth 54.9%

Caratlytics Score

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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 4
Current: £436 GBP|Low: £203 GBP|High: £1,059 GBP|Avg: £492 GBP|+0.3%
Retailer 1
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Retailer 19
November 5, 2026
Retailer 4£203 GBP
Retailer 7£227 GBP
Retailer 3£236 GBP
Retailer 2£252 GBP
Retailer 9£252 GBP
Retailer 13£259 GBP
Retailer 19£335 GBP
Retailer 14£370 GBP
Retailer 17£394 GBP
Retailer 16£434 GBP
Retailer 1£436 GBP
Retailer 10£439 GBP
Retailer 18£597 GBP
Retailer 15£618 GBP
Retailer 6£644 GBP
Retailer 8£810 GBP
Retailer 11£847 GBP
Retailer 12£1,006 GBP
Retailer 5£1,059 GBP

16 data points across 19 retailers

20 retailers£203 GBP to £2,282 GBP

A
Cheapest Retailer
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£203 GBP
A
Retailer 2
-
£227 GBP
View
Final sale: no returns
A
Retailer 3
-
£236 GBP
View
Retailer 4
-
£252 GBP
View
Price last confirmed 11 days ago
A
Retailer 5
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£252 GBP
View
A
Retailer 6
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£259 GBP
View
A
Retailer 7
-
£335 GBP
View
A
Retailer 8
-
£370 GBP
View
A
Retailer 9
-
£394 GBP
View
A
Retailer 10
-
£434 GBP
View
A
Retailer 11
-
£436 GBP
View
A
Retailer 12
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£439 GBP
View
A
Retailer 13
-
£597 GBP
View
A
Retailer 14
-
£618 GBP
View
B+
Retailer 15
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£644 GBP
View
B+
Retailer 16
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£810 GBP
View
B+
Retailer 17
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£847 GBP
View
B+
Retailer 18
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£1,006 GBP
View
B
Retailer 19
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£1,059 GBP
View
Most Expensive
B
Brilliant Earth
22274415A · Oct 30
£2,282 GBP
$3,080 USD
View
19 more retailers have this diamond
Prices start from £203 GBPSave up to £2,079 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
1.29ct Heart
£203 GBP