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Round|Lab Grown|IGI

3.00ct J SI1 Round Lab Grown Diamond

EX • J/SI1 • IGI LG485136506

Shape and cutting style on the report: Round brilliant

Certificate IGI LG485136506

Diamond specifications and retailer prices

From £1,248 GBP
As of November 5, 2026
Save £5,828 GBP (82%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: £9,372 GBP at MOH London · As of October 29, 2026
View at MOH London

About this 3ct lab-grown round diamond

This 3ct lab-grown round sits in the three to five carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG485136506 or 485136506. Listed at 12 retailers as of November 4, 2026, with a 467% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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

3.00
Carat
J
Colour
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.8°
Pavilion angle40.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG485136506
Dimensions9.41 × 9.38 × 5.45 mm
L/W Ratio1.00
Girdle conditionFaceted
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
9.41 mm9.38 mm3.00 ctJ / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG485136506
Side View
Table 63.0%Crown 32.8°Girdle: MED-STKPavilion 40.1°Culet: NoneDepth 58.0%

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: Nov 5
Current: £9,372 GBP|Low: £1,248 GBP|High: £9,446 GBP|Avg: £5,036 GBP|+0.5%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
November 5, 2026
Retailer 6£1,248 GBP
Retailer 8£3,949 GBP
Retailer 12£4,138 GBP
Retailer 11£4,423 GBP
Retailer 3£4,581 GBP
Retailer 9£4,581 GBP
Retailer 4£4,592 GBP
Retailer 2£4,604 GBP
Retailer 5£4,902 GBP
Retailer 13£5,438 GBP
Retailer 7£5,642 GBP
Retailer 10£7,076 GBP
MOH London£9,372 GBP

40 data points across 13 retailers

12 retailers£1,248 GBP to £7,076 GBP

A
Cheapest Retailer
-
£1,248 GBP
B+
Retailer 2
-
£3,949 GBP
View
B+
Retailer 3
-
£4,138 GBP
View
B+
Retailer 4
-
£4,423 GBP
View
Final sale: no returns
B+
Retailer 5
-
£4,581 GBP
View
Retailer 6
-
£4,581 GBP
View
Price last confirmed 25 days ago
B+
Retailer 7
-
£4,592 GBP
View
B+
Retailer 8
-
£4,604 GBP
View
B
Retailer 9
-
£5,438 GBP
View
B
Retailer 10
-
£5,642 GBP
View
B
Retailer 11
-
£7,076 GBP
View
Most Expensive
MOH London
LG485136506 · Oct 29
£9,372 GBP
View
Price last confirmed 7 days ago
11 more retailers have this diamond
Prices start from £1,248 GBPSave up to £5,828 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
3.00ct Round
£1,248 GBP