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Round|Lab Grown|IGI

1.37ct J SI1 Round Lab Grown Diamond

EX • J/SI1 • IGI LG451057583

Shape and cutting style on the report: Round brilliant

Certificate IGI LG451057583

Diamond specifications and retailer prices

From £481 GBP
As of November 5, 2026
Save £1,866 GBP (79%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £2,348 GBP at MOH London · As of November 5, 2026
View at MOH London

About this 1.37ct lab-grown round diamond

This 1.37ct 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 LG451057583 or 451057583. Listed at 11 retailers as of November 5, 2026, with prices from £481 to £2,348, a £1,866 spread on the same certified stone. MOH London lists it at £2,348. 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

1.37
Carat
J
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
Crown angle31.6°
Pavilion angle40.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG451057583
Dimensions7.31 × 7.26 × 4.25 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizePointed
Cert comments
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Top View
7.31 mm7.26 mm1.37 ctJ / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryVery Good
FluorescenceNone
CertificateIGI LG451057583
Side View
Table 57.5%Crown 31.6°Girdle: MED-STKPavilion 40.1°Culet: NoneDepth 58.3%

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: £2,348 GBP|Low: £463 GBP|High: £2,383 GBP|Avg: £1,029 GBP|-0.3%
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£481 GBP
Retailer 8£539 GBP
Retailer 6£559 GBP
Retailer 2£587 GBP
Retailer 4£691 GBP
Retailer 9£909 GBP
Retailer 7£912 GBP
Retailer 3£1,427 GBP
Retailer 10£1,599 GBP
MOH London£2,348 GBP

16 data points across 10 retailers

11 retailers£481 GBP to £2,348 GBP

A
Cheapest Retailer
-
£481 GBP
B+
Retailer 2
-
£525 GBP
View
B+
Retailer 3
-
£539 GBP
View
Final sale: no returns
Retailer 4
-
£559 GBP
View
Price last confirmed 21 days ago
B+
Retailer 5
-
£559 GBP
View
B+
Retailer 6
-
£587 GBP
View
B+
Retailer 7
-
£691 GBP
View
B
Retailer 8
-
£912 GBP
View
B
Retailer 9
-
£1,427 GBP
View
B
Retailer 10
-
£1,571 GBP
View
Most Expensive
B
MOH London
LG451057583 · Nov 5
£2,348 GBP
View
10 more retailers have this diamond
Prices start from £481 GBPSave up to £1,866 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
1.37ct Round
£481 GBP