Radiant|Lab Grown|IGI

1.51ct E IF Radiant Lab Grown Diamond

ID • E/IF • IGI LG654418105

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

Certificate IGI LG654418105

Diamond specifications and retailer prices

From £313 GBP
$419 USD
As of October 30, 2026
Save £1,138 GBP (78%) vs most expensive(unlock to see where)
25 retailers carry this diamond
Most expensive: £1,743 GBP at Rare Carat · As of October 18, 2026
View at Rare Carat

About this 1.51ct lab-grown radiant diamond

This 1.51ct lab-grown radiant sits in the one-and-a-half to two carat band, graded E colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG654418105 or 654418105. Listed at 25 retailers as of October 30, 2026, with a 364% 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

1.51
Carat
E
Colour
IF
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle40.5°
Pavilion angle33.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG654418105
Dimensions8.05 × 5.68 × 3.83 mm
L/W Ratio1.42
Culet sizePointed
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
8.05 mm5.68 mm1.51 ctE / IF
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG654418105
Side View
Table 66.0%Crown 40.5°Girdle: MediumPavilion 33.9°Culet: NoneDepth 67.4%

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: Oct 30
Current: £1,743 GBP|Low: £300 GBP|High: £1,769 GBP|Avg: £821 GBP|-1.5%
Rare Carat
Retailer 2
Retailer 3
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Retailer 6
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Retailer 11
Retailer 12
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Retailer 19
November 1, 2026
Retailer 19£313 GBP
Retailer 6£350 GBP
Retailer 10£350 GBP
Retailer 4£387 GBP
Retailer 7£387 GBP
Retailer 17£496 GBP
Retailer 2£545 GBP
Retailer 9£567 GBP
Retailer 12£638 GBP
Retailer 13£644 GBP
Retailer 16£666 GBP
Retailer 14£903 GBP
Retailer 18£1,087 GBP
Retailer 11£1,126 GBP
Retailer 8£1,233 GBP
Retailer 5£1,246 GBP
Retailer 3£1,420 GBP
Retailer 15£1,431 GBP
Rare Carat£1,743 GBP

44 data points across 19 retailers

25 retailers£313 GBP to £1,451 GBP

A
Cheapest Retailer
-
£313 GBP
$419 USD
A
Retailer 2
-
£350 GBP
$469 USD
View
Final sale: no returns
A
Retailer 3
-
£350 GBP
$469 USD
View
Retailer 4
-
£387 GBP
$519 USD
View
Price last confirmed 7 days ago
A
Retailer 5
-
£387 GBP
$519 USD
View
A
Retailer 6
-
£430 GBP
HK$4,500 HKD
View
A
Retailer 7
-
£496 GBP
$665 USD
View
A
Retailer 8
-
£545 GBP
$730 USD
View
A
Retailer 9
-
£567 GBP
$760 USD
View
A
Retailer 10
-
£638 GBP
View
A
Retailer 11
-
£644 GBP
€822 EUR
View
A
Retailer 12
-
£666 GBP
ZAR 14,419 ZAR
View
B+
Retailer 13
-
£790 GBP
$1,058 USD
View
B+
Retailer 14
-
£903 GBP
A$1,861 AUD
View
B+
Retailer 15
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£1,005 GBP
View
B+
Retailer 16
-
£1,087 GBP
$1,457 USD
View
B+
Retailer 17
-
£1,126 GBP
View
B+
Retailer 18
-
£1,233 GBP
SGD 2,232 SGD
View
B+
Retailer 19
-
£1,246 GBP
$1,670 USD
View
B
Retailer 20
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£1,271 GBP
$1,703 USD
View
B
Retailer 21
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£1,412 GBP
$1,892 USD
View
B
Retailer 22
-
£1,420 GBP
$1,902 USD
View
B+
Retailer 23
-
£1,431 GBP
View
B
Retailer 24
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£1,451 GBP
$1,944 USD
View
Most Expensive
Rare Carat
197B56-7A · Oct 18
£1,743 GBP
$2,335 USD
View
Price last confirmed 14 days ago
24 more retailers have this diamond
Prices start from £313 GBPSave up to £1,138 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
1.51ct Radiant
£313 GBP