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Radiant|Lab Grown|IGI

1.51ct E IF Radiant Lab Grown Diamond

EX • E/IF • IGI LG816657809

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

Certificate IGI LG816657809

Diamond specifications and retailer prices

From £438 GBP
€559 EUR
As of October 31, 2026
Save £638 GBP (59%) vs most expensive(unlock to see where)
9 retailers carry this diamond
Most expensive: £1,698 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 LG816657809 or 816657809. Listed at 9 retailers as of October 31, 2026, with a 146% 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
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle27.2°
Pavilion angle35.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG816657809
Dimensions8.03 × 5.73 × 3.81 mm
L/W Ratio1.40
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
8.03 mm5.73 mm1.51 ctE / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG816657809
Side View
Table 66.0%Crown 27.2°Girdle: Slightly ThickPavilion 35.6°Culet: NoneDepth 66.5%

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 31
Current: £1,698 GBP|Low: £362 GBP|High: £1,720 GBP|Avg: £761 GBP|+4.8%
Rare Carat
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
November 1, 2026
Retailer 4£438 GBP
Retailer 5£441 GBP
Retailer 6£463 GBP
Retailer 3£475 GBP
Retailer 8£755 GBP
Retailer 7£825 GBP
Retailer 2£1,076 GBP
Rare Carat£1,698 GBP

42 data points across 8 retailers

9 retailers£438 GBP to £1,076 GBP

A
Cheapest Retailer
-
£438 GBP
€559 EUR
A
Retailer 2
-
£441 GBP
$591 USD
View
A
Retailer 3
-
£463 GBP
$620 USD
View
A
Retailer 4
-
£475 GBP
View
B+
Retailer 5
-
£755 GBP
$1,012 USD
View
B+
Retailer 6
-
£842 GBP
$1,128 USD
View
B+
Retailer 7
-
£899 GBP
$1,205 USD
View
B+
Retailer 8
-
£1,076 GBP
View
Most Expensive
Rare Carat
NV54-113A · Oct 18
£1,698 GBP
$2,275 USD
View
Price last confirmed 14 days ago
8 more retailers have this diamond
Prices start from £438 GBPSave up to £638 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
£438 GBP