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Princess|Lab Grown|IGI

1.23ct E SI1 Princess Lab Grown Diamond

ID • E/SI1 • IGI LG555291418

Shape and cutting style on the report: Princess cut

Certificate IGI LG555291418

Diamond specifications and retailer prices

From £118 GBP
$158 USD
As of October 30, 2026
Save £569 GBP (83%) vs most expensive(unlock to see where)
16 retailers carry this diamond
Most expensive: £687 GBP at MOH London · As of October 29, 2026
View at MOH London

About this 1.23ct lab-grown princess diamond

This 1.23ct lab-grown princess sits in the classic one-carat band, graded E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG555291418 or 555291418. Listed at 16 retailers as of October 29, 2026, with prices from £118 to £687, a £569 spread on the same certified stone. MOH London lists it at £687. 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

1.23
Carat
E
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle46°
Pavilion angle39.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG555291418
Dimensions5.82 × 5.68 × 4.16 mm
L/W Ratio1.02
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
5.82 mm5.68 mm1.23 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG555291418
Side View
Table 71.0%Crown 46°Girdle: MediumPavilion 39.1°Culet: NoneDepth 73.2%

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: £687 GBP|Low: £108 GBP|High: £806 GBP|Avg: £320 GBP|+5.4%
MOH London
Retailer 2
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Retailer 10
Retailer 11
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Retailer 16
October 30, 2026
Retailer 5£118 GBP
Retailer 3£137 GBP
Retailer 13£146 GBP
Retailer 14£146 GBP
Retailer 9£190 GBP
Retailer 7£198 GBP
Retailer 11£252 GBP
Retailer 10£257 GBP
Retailer 12£285 GBP
Retailer 16£302 GBP
Retailer 4£390 GBP
Retailer 15£470 GBP
Retailer 6£496 GBP
Retailer 2£567 GBP
Retailer 8£568 GBP
MOH London£687 GBP

44 data points across 16 retailers

16 retailers£118 GBP to £687 GBP

A
Cheapest Retailer
-
£118 GBP
$158 USD
A
Retailer 2
-
£137 GBP
$183 USD
View
A
Retailer 3
-
£146 GBP
$196 USD
View
A
Retailer 4
-
£146 GBP
$196 USD
View
A
Retailer 5
-
£190 GBP
View
B+
Retailer 6
-
£198 GBP
$265 USD
View
A
Retailer 7
-
£252 GBP
€322 EUR
View
B+
Retailer 8
-
£257 GBP
View
B+
Retailer 9
-
£285 GBP
View
B+
Retailer 10
-
£302 GBP
$404 USD
View
B+
Retailer 11
-
£390 GBP
$522 USD
View
B
Retailer 12
-
£470 GBP
$630 USD
View
B
Retailer 13
-
£496 GBP
$665 USD
View
B
Retailer 14
-
£567 GBP
$760 USD
View
Retailer 15
-
£568 GBP
SGD 1,029 SGD
View
Price last confirmed 18 days ago
Most Expensive
B
MOH London
LG555291418 · Oct 29
£687 GBP
View
15 more retailers have this diamond
Prices start from £118 GBPSave up to £569 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
1.23ct Princess
£118 GBP