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1.35ct J SI1 Round Lab Grown Diamond

EX • J/SI1 • IGI LG436074626

Shape and cutting style on the report: Round brilliant

Certificate IGI LG436074626

Diamond specifications and retailer prices

From £475 GBP
As of November 5, 2026
Save £1,841 GBP (79%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £2,316 GBP at MOH London · As of November 5, 2026
View at MOH London

About this 1.35ct lab-grown round diamond

This 1.35ct 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 LG436074626 or 436074626. Listed at 12 retailers as of November 5, 2026, with prices from £475 to £2,316, a £1,841 spread on the same certified stone. MOH London lists it at £2,316. 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

1.35
Carat
J
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.3°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG436074626
Dimensions7.05 × 7.03 × 4.42 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
7.05 mm7.03 mm1.35 ctJ / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG436074626
Side View
Table 56.5%Crown 36.3°Girdle: MED-STKPavilion 40.8°Culet: NoneDepth 62.8%

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: £2,316 GBP|Low: £380 GBP|High: £2,350 GBP|Avg: £938 GBP|-0.2%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
November 5, 2026
Retailer 7£475 GBP
Retailer 10£532 GBP
Retailer 8£551 GBP
Retailer 11£551 GBP
Retailer 2£572 GBP
Retailer 12£608 GBP
Retailer 5£684 GBP
Retailer 3£898 GBP
Retailer 9£901 GBP
Retailer 6£1,407 GBP
Retailer 4£1,577 GBP
MOH London£2,316 GBP

22 data points across 12 retailers

12 retailers£475 GBP to £2,316 GBP

A
Cheapest Retailer
-
£475 GBP
A
Retailer 2
-
£517 GBP
View
B+
Retailer 3
-
£532 GBP
View
Final sale: no returns
Retailer 4
-
£551 GBP
View
Price last confirmed 21 days ago
B+
Retailer 5
-
£551 GBP
View
B+
Retailer 6
-
£572 GBP
View
B+
Retailer 7
-
£608 GBP
View
B+
Retailer 8
-
£684 GBP
View
B
Retailer 9
-
£901 GBP
View
B
Retailer 10
-
£1,407 GBP
View
B
Retailer 11
-
£1,549 GBP
View
Most Expensive
B
MOH London
LG436074626 · Nov 5
£2,316 GBP
View
11 more retailers have this diamond
Prices start from £475 GBPSave up to £1,841 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
1.35ct Round
£475 GBP