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Heart|Lab Grown|IGI

1.42ct D FL Heart Lab Grown Diamond

ID • D/FL • IGI LG816614783

Shape and cutting style on the report: Heart brilliant

Certificate IGI LG816614783

Diamond specifications and retailer prices

From £275 GBP
As of November 4, 2026
Save £1,918 GBP (87%) vs most expensive(unlock to see where)
18 retailers carry this diamond
Most expensive: £3,237 GBP at Brilliant Earth · As of September 28, 2026
View at Brilliant Earth

About this 1.42ct lab-grown heart diamond

This 1.42ct lab-grown heart sits in the one-and-a-quarter to one-and-a-half carat band, graded D colour (colourless) and FL clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG816614783 or 816614783. Listed at 18 retailers as of November 4, 2026, with a 698% 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

1.42
Carat
D
Colour
FL
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.2°
Pavilion angle38.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG816614783
Dimensions7.78 × 6.97 × 4.46 mm
L/W Ratio1.12
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
7.78 mm6.97 mm1.42 ctD / FL
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG816614783
Side View
Table 58.0%Crown 34.2°Girdle: STK-THKPavilion 38.6°Culet: NoneDepth 57.3%

Caratlytics Score

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A+
Exceptional
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: £2,193 GBP|Low: £275 GBP|High: £2,193 GBP|Avg: £790 GBP
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
Retailer 14
Retailer 15
Retailer 16
Retailer 17
November 5, 2026
Retailer 6£275 GBP
Retailer 3£307 GBP
Retailer 12£319 GBP
Retailer 17£341 GBP
Retailer 9£361 GBP
Retailer 13£452 GBP
Retailer 11£544 GBP
Retailer 2£609 GBP
Retailer 7£621 GBP
Retailer 14£787 GBP
Retailer 15£861 GBP
Retailer 10£1,096 GBP
Retailer 16£1,124 GBP
Retailer 4£1,184 GBP
Retailer 5£1,366 GBP
Retailer 8£1,410 GBP
Brilliant Earth£2,193 GBP

29 data points across 17 retailers

18 retailers£275 GBP to £2,193 GBP

A+
Cheapest Retailer
-
£275 GBP
A
Retailer 2
-
£307 GBP
View
Final sale: no returns
A
Retailer 3
-
£319 GBP
View
A
Retailer 4
-
£341 GBP
View
Retailer 5
-
£361 GBP
View
Price last confirmed 11 days ago
A
Retailer 6
-
£452 GBP
View
A
Retailer 7
-
£544 GBP
View
A
Retailer 8
-
£609 GBP
View
A
Retailer 9
-
£621 GBP
View
B+
Retailer 10
-
£787 GBP
View
B+
Retailer 11
-
£861 GBP
View
B+
Retailer 12
-
£1,096 GBP
View
B+
Retailer 13
-
£1,124 GBP
View
B+
Retailer 14
-
£1,184 GBP
View
B+
Retailer 15
-
£1,366 GBP
View
B+
Retailer 16
-
£1,410 GBP
View
B
Retailer 17
-
£2,193 GBP
View
Most Expensive
Brilliant Earth
21094848A · Sep 28
£3,237 GBP
$4,370 USD
View
Price last confirmed 37 days ago
17 more retailers have this diamond
Prices start from £275 GBPSave up to £1,918 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+
1.42ct Heart
£275 GBP