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Radiant|Lab Grown|IGI

1.55ct E SI1 Radiant Lab Grown Diamond

EX • E/SI1 • IGI LG641483559

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

Certificate IGI LG641483559

Diamond specifications and retailer prices

From £137 GBP
$182 USD
As of October 30, 2026
Save £727 GBP (84%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: £864 GBP at Brilliant Earth · As of October 29, 2026
View at Brilliant Earth

About this 1.55ct lab-grown radiant diamond

This 1.55ct lab-grown radiant sits in the one-and-a-half to two carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG641483559 or 641483559. Listed at 19 retailers as of October 29, 2026, with prices from £137 to £864, a £727 spread on the same certified stone. Brilliant Earth lists it at £864. 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

1.55
Carat
E
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle43°
Pavilion angle35.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG641483559
Dimensions8.24 × 5.68 × 3.73 mm
L/W Ratio1.45
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
8.24 mm5.68 mm1.55 ctE / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG641483559
Side View
Table 63.0%Crown 43°Girdle: MED-STKPavilion 35.1°Culet: NoneDepth 65.7%

Caratlytics Score

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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: £864 GBP|Low: £128 GBP|High: £864 GBP|Avg: £366 GBP
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
Retailer 14
Retailer 15
October 30, 2026
Retailer 8£137 GBP
Retailer 7£165 GBP
Retailer 14£169 GBP
Retailer 2£174 GBP
Retailer 11£217 GBP
Retailer 3£278 GBP
Retailer 9£298 GBP
Retailer 12£305 GBP
Retailer 5£423 GBP
Retailer 6£530 GBP
Retailer 13£584 GBP
Retailer 4£650 GBP
Retailer 15£775 GBP
Retailer 10£852 GBP
Brilliant Earth£864 GBP

36 data points across 15 retailers

19 retailers£137 GBP to £864 GBP

A
Cheapest Retailer
-
£137 GBP
$182 USD
A
Retailer 2
-
£154 GBP
$205 USD
View
A
Retailer 3
-
£165 GBP
$220 USD
View
A
Retailer 4
-
£169 GBP
$225 USD
View
A
Retailer 5
-
£174 GBP
$232 USD
View
Final sale: no returns
A
Retailer 6
-
£217 GBP
View
A
Retailer 7
-
£278 GBP
€352 EUR
View
B+
Retailer 8
-
£298 GBP
$397 USD
View
A
Retailer 9
-
£305 GBP
View
B+
Retailer 10
-
£350 GBP
$466 USD
View
B+
Retailer 11
-
£418 GBP
$556 USD
View
B+
Retailer 12
-
£423 GBP
$563 USD
View
B+
Retailer 13
-
£530 GBP
$706 USD
View
B+
Retailer 14
-
£584 GBP
$778 USD
View
B
Retailer 15
-
£593 GBP
View
Retailer 16
-
£650 GBP
$865 USD
View
Price last confirmed 11 days ago
B
Retailer 17
-
£775 GBP
View
B
Retailer 18
-
£852 GBP
$1,135 USD
View
Most Expensive
B
Brilliant Earth
14997655A · Oct 29
£864 GBP
$1,150 USD
View
18 more retailers have this diamond
Prices start from £137 GBPSave up to £727 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
1.55ct Radiant
£137 GBP