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Radiant|Lab Grown|IGI

1.51ct D IF Radiant Lab Grown Diamond

EX • D/IF • IGI LG754508490

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

Certificate IGI LG754508490

Diamond specifications and retailer prices

From £216 GBP
$290 USD
As of November 2, 2026
Save £1,742 GBP (89%) vs most expensive(unlock to see where)
31 retailers carry this diamond
Most expensive: £1,958 GBP at Blue Nile · As of October 31, 2026
View at Blue Nile

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 D colour (colourless) and IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG754508490 or 754508490. Listed at 31 retailers as of October 31, 2026, with prices from £216 to £1,958, a £1,742 spread on the same certified stone. Blue Nile lists it at £1,958. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.51
Carat
D
Colour
IF
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle40.2°
Pavilion angle33.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG754508490
Dimensions5.71 × 5.71 × 3.65 mm
L/W Ratio1.00
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
5.71 mm5.71 mm1.51 ctD / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG754508490
Side View
Table 61.0%Crown 40.2°Girdle: Slightly ThickPavilion 33.2°Culet: NoneDepth 63.9%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 2
Current: £313 GBP|Low: £216 GBP|High: £1,923 GBP|Avg: £778 GBP|-1.3%
Retailer 1
Retailer 2
Retailer 3
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Retailer 11
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Retailer 22
November 2, 2026
Retailer 5£216 GBP
Retailer 9£259 GBP
Retailer 1£313 GBP
Retailer 20£380 GBP
Retailer 13£391 GBP
Retailer 7£417 GBP
Retailer 10£462 GBP
Retailer 17£481 GBP
Retailer 12£511 GBP
Retailer 16£529 GBP
Retailer 8£587 GBP
Retailer 11£668 GBP
Retailer 19£690 GBP
Retailer 22£824 GBP
Retailer 2£1,031 GBP
Retailer 14£1,073 GBP
Retailer 4£1,101 GBP
Retailer 15£1,144 GBP
Retailer 18£1,193 GBP
Retailer 6£1,231 GBP
Retailer 21£1,829 GBP
Retailer 3£1,923 GBP

33 data points across 22 retailers

31 retailers£216 GBP to £1,958 GBP

A
Cheapest Retailer
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£216 GBP
$290 USD
Retailer 2
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£216 GBP
$290 USD
View
Price last confirmed 25 days ago
Retailer 3
-
£230 GBP
$309 USD
View
Price last confirmed 34 days ago
A
Retailer 4
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£259 GBP
$347 USD
View
Final sale: no returns
Retailer 5
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£267 GBP
$358 USD
View
Price last confirmed 36 days ago
Retailer 6
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£268 GBP
$360 USD
View
Price last confirmed 30 days ago
Retailer 7
-
£282 GBP
$378 USD
View
Price last confirmed 35 days ago
A
Retailer 8
-
£313 GBP
View
A
Retailer 9
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£380 GBP
$510 USD
View
A
Retailer 10
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£391 GBP
HK$4,100 HKD
View
A
Retailer 11
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£417 GBP
$560 USD
View
A
Retailer 12
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£462 GBP
$620 USD
View
A
Retailer 13
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£481 GBP
€615 EUR
View
A
Retailer 14
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£511 GBP
ZAR 11,071 ZAR
View
A
Retailer 15
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£529 GBP
View
A
Retailer 16
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£587 GBP
$788 USD
View
A
Retailer 17
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£668 GBP
$897 USD
View
A
Retailer 18
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£690 GBP
A$1,425 AUD
View
B+
Retailer 19
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£824 GBP
$1,106 USD
View
Retailer 20
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£952 GBP
$1,277 USD
View
Price last confirmed 23 days ago
B+
Retailer 21
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£952 GBP
$1,277 USD
View
Retailer 22
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£1,012 GBP
$1,358 USD
View
Price last confirmed 33 days ago
B+
Retailer 23
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£1,031 GBP
$1,384 USD
View
B+
Retailer 24
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£1,073 GBP
$1,440 USD
View
B+
Retailer 25
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£1,101 GBP
$1,478 USD
View
B+
Retailer 26
-
£1,144 GBP
SGD 2,075 SGD
View
B+
Retailer 27
-
£1,193 GBP
View
Retailer 28
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£1,231 GBP
A$2,541 AUD
View
Price last confirmed 26 days ago
B
Retailer 29
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£1,829 GBP
$2,455 USD
View
B
Retailer 30
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£1,923 GBP
$2,580 USD
View
Most Expensive
B
Blue Nile
28929650 · Oct 31
£1,958 GBP
$2,628 USD
View
30 more retailers have this diamond
Prices start from £216 GBPSave up to £1,742 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
£216 GBP