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Radiant|Lab Grown|IGI

1.56ct F IF Radiant Lab Grown Diamond

ID • F/IF • IGI LG620429386

Shape and cutting style on the report: Cut cornered rectangular modified brilliant

Certificate IGI LG620429386

Diamond specifications and retailer prices

From £201 GBP
As of November 4, 2026
Save £1,671 GBP (89%) vs most expensive(unlock to see where)
21 retailers carry this diamond
Most expensive: £2,103 GBP at Brilliant Earth · As of October 21, 2026
View at Brilliant Earth

About this 1.56ct lab-grown radiant diamond

This 1.56ct lab-grown radiant sits in the one-and-a-half to two carat band, graded F colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG620429386 or 620429386. Listed at 21 retailers as of November 4, 2026, with a 830% 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

1.56
Carat
F
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle50.8°
Pavilion angle33°
OriginLab Grown
Grading LabIGI
CertificateIGI LG620429386
Dimensions8.10 × 5.76 × 3.75 mm
L/W Ratio1.41
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
8.10 mm5.76 mm1.56 ctF / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG620429386
Side View
Table 65.0%Crown 50.8°Girdle: MED-THKPavilion 33°Culet: NoneDepth 65.1%

Caratlytics Score

How it works →
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: £1,872 GBP|Low: £201 GBP|High: £2,103 GBP|Avg: £774 GBP|-11.0%
Brilliant Earth
Retailer 2
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Retailer 21
November 5, 2026
Retailer 12£201 GBP
Retailer 11£233 GBP
Retailer 21£250 GBP
Retailer 15£282 GBP
Retailer 3£368 GBP
Retailer 9£414 GBP
Retailer 19£441 GBP
Retailer 18£474 GBP
Retailer 2£484 GBP
Retailer 5£501 GBP
Retailer 7£614 GBP
Retailer 16£646 GBP
Retailer 20£766 GBP
Retailer 6£885 GBP
Retailer 17£943 GBP
Retailer 8£1,007 GBP
Retailer 10£1,032 GBP
Retailer 13£1,100 GBP
Retailer 14£1,488 GBP
Retailer 4£1,783 GBP
Brilliant Earth£1,872 GBP

11 data points across 21 retailers

21 retailers£201 GBP to £1,872 GBP

A
Cheapest Retailer
-
£201 GBP
A
Retailer 2
-
£233 GBP
View
A
Retailer 3
-
£250 GBP
View
A
Retailer 4
-
£282 GBP
View
A
Retailer 5
-
£368 GBP
View
A
Retailer 6
-
£414 GBP
View
A
Retailer 7
-
£441 GBP
View
A
Retailer 8
-
£474 GBP
View
A
Retailer 9
-
£484 GBP
View
A
Retailer 10
-
£501 GBP
View
A
Retailer 11
-
£614 GBP
View
B+
Retailer 12
-
£646 GBP
View
B+
Retailer 13
-
£766 GBP
View
B+
Retailer 14
-
£885 GBP
View
B+
Retailer 15
-
£943 GBP
View
B+
Retailer 16
-
£1,007 GBP
View
B+
Retailer 17
-
£1,032 GBP
View
B+
Retailer 18
-
£1,100 GBP
View
B
Retailer 19
-
£1,783 GBP
View
B
Retailer 20
-
£1,872 GBP
View
Most Expensive
Brilliant Earth
13715575B · Oct 21
£2,103 GBP
$2,830 USD
View
Price last confirmed 15 days ago
20 more retailers have this diamond
Prices start from £201 GBPSave up to £1,671 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
1.56ct Radiant
£201 GBP