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1.33ct J SI1 Round Lab Grown Diamond

ID • J/SI1 • IGI LG492123252

Shape and cutting style on the report: Round brilliant

Certificate IGI LG492123252

Diamond specifications and retailer prices

From £468 GBP
As of November 5, 2026
Save £1,814 GBP (79%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £2,283 GBP at MOH London · As of November 5, 2026
View at MOH London

About this 1.33ct lab-grown round diamond

This 1.33ct lab-grown round sits in the one-and-a-quarter to one-and-a-half carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG492123252 or 492123252. Listed at 11 retailers as of November 5, 2026, with prices from £468 to £2,283, a £1,814 spread on the same certified stone. MOH London lists it at £2,283. 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

1.33
Carat
J
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33°
Pavilion angle40.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG492123252
Dimensions7.11 × 7.12 × 4.30 mm
L/W Ratio1.00
Girdle conditionFaceted
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
7.11 mm7.12 mm1.33 ctJ / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG492123252
Side View
Table 59.5%Crown 33°Girdle: MED-STKPavilion 40.9°Culet: NoneDepth 60.3%

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: Nov 5
Current: £2,283 GBP|Low: £450 GBP|High: £2,316 GBP|Avg: £890 GBP|-1.3%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 5, 2026
Retailer 5£468 GBP
Retailer 8£525 GBP
Retailer 6£543 GBP
Retailer 9£543 GBP
Retailer 2£565 GBP
Retailer 3£676 GBP
Retailer 7£888 GBP
Retailer 10£888 GBP
Retailer 4£1,388 GBP
MOH London£2,283 GBP

21 data points across 10 retailers

11 retailers£468 GBP to £2,283 GBP

A
Cheapest Retailer
-
£468 GBP
A
Retailer 2
-
£510 GBP
View
B+
Retailer 3
-
£525 GBP
View
Final sale: no returns
Retailer 4
-
£543 GBP
View
Price last confirmed 21 days ago
B+
Retailer 5
-
£543 GBP
View
B+
Retailer 6
-
£565 GBP
View
B+
Retailer 7
-
£676 GBP
View
B
Retailer 8
-
£888 GBP
View
B
Retailer 9
-
£1,388 GBP
View
B
Retailer 10
-
£1,528 GBP
View
Most Expensive
B
MOH London
LG492123252 · Nov 5
£2,283 GBP
View
10 more retailers have this diamond
Prices start from £468 GBPSave up to £1,814 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
1.33ct Round
£468 GBP