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Radiant|Lab Grown|IGI

1.51ct D SI1 Radiant Lab Grown Diamond

ID • D/SI1 • IGI LG542235603

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

Certificate IGI LG542235603

Diamond specifications and retailer prices

From £191 GBP
As of November 6, 2026
Save £735 GBP (79%) vs most expensive(unlock to see where)
5 retailers carry this diamond
Most expensive: £926 GBP at Brilliant Earth · As of November 6, 2026
View at Brilliant Earth

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 SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG542235603 or 542235603. Listed at 5 retailers as of November 6, 2026, with prices from £191 to £926, a £735 spread on the same certified stone. Brilliant Earth lists it at £926. SI-grade stones are eye-clean roughly 60 to 70% of the time at this carat range. Check the inclusion plot on the cert and ask the retailer for high-resolution video before buying.

The 4Cs

1.51
Carat
D
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle44°
Pavilion angle33.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG542235603
Dimensions7.78 × 5.58 × 3.93 mm
L/W Ratio1.39
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
7.78 mm5.58 mm1.51 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG542235603
Side View
Table 64.5%Crown 44°Girdle: Slightly ThickPavilion 33.3°Culet: NoneDepth 70.4%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 6
Current: £926 GBP|Low: £121 GBP|High: £1,509 GBP|Avg: £444 GBP|-38.6%
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
November 6, 2026
Retailer 9£121 GBP
Retailer 6£191 GBP
Retailer 10£223 GBP
Retailer 7£224 GBP
Retailer 11£253 GBP
Retailer 2£283 GBP
Retailer 12£353 GBP
Retailer 5£421 GBP
Retailer 3£447 GBP
Retailer 4£477 GBP
Retailer 8£634 GBP
Retailer 13£764 GBP
Brilliant Earth£926 GBP

12 data points across 13 retailers

5 retailers£191 GBP to £926 GBP

A
Cheapest Retailer
-
£191 GBP
B+
Retailer 2
-
£224 GBP
View
A
Retailer 3
-
£283 GBP
View
B+
Retailer 4
-
£569 GBP
View
Most Expensive
B
Brilliant Earth
16423023A · Nov 6
£926 GBP
$1,240 USD
View
4 more retailers have this diamond
Prices start from £191 GBPSave up to £735 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
£191 GBP