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Radiant|Lab Grown|IGI

1.55ct E SI1 Radiant Lab Grown Diamond

ID • E/SI1 • IGI LG600355829

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

Certificate IGI LG600355829

Diamond specifications and retailer prices

From £288 GBP
$384 USD
As of October 30, 2026
Save £643 GBP (69%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £931 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 LG600355829 or 600355829. Listed at 11 retailers as of October 29, 2026, with prices from £288 to £931, a £643 spread on the same certified stone. Brilliant Earth lists it at £931. 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
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle43.6°
Pavilion angle35.4°
OriginLab Grown
Grading LabIGI
CertificateIGI LG600355829
Dimensions8.31 × 5.68 × 3.86 mm
L/W Ratio1.46
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
8.31 mm5.68 mm1.55 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG600355829
Side View
Table 65.0%Crown 43.6°Girdle: MediumPavilion 35.4°Culet: NoneDepth 68.0%

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: £931 GBP|Low: £105 GBP|High: £999 GBP|Avg: £438 GBP|-6.8%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 30, 2026
Retailer 7£146 GBP
Retailer 6£288 GBP
Retailer 2£289 GBP
Retailer 4£305 GBP
Retailer 9£349 GBP
Retailer 8£415 GBP
Retailer 3£548 GBP
Retailer 5£758 GBP
Brilliant Earth£931 GBP

38 data points across 9 retailers

11 retailers£288 GBP to £931 GBP

Retailer 1
-
£151 GBP
$201 USD
Price last confirmed 32 days ago
Retailer 2
-
£159 GBP
$212 USD
View
Price last confirmed 32 days ago
B+
Retailer 3
-
£288 GBP
$384 USD
View
A
Retailer 4
-
£289 GBP
View
A
Retailer 5
-
£305 GBP
€387 EUR
View
B+
Retailer 6
-
£349 GBP
$465 USD
View
B+
Retailer 7
-
£415 GBP
$552 USD
View
B
Retailer 8
-
£548 GBP
$730 USD
View
B+
Retailer 9
-
£567 GBP
View
Retailer 10
-
£758 GBP
View
Price last confirmed 9 days ago
Most Expensive
B
Brilliant Earth
8177429A · Oct 29
£931 GBP
$1,240 USD
View
10 more retailers have this diamond
Prices start from £288 GBPSave up to £643 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
£288 GBP