CaratHunter
Plans
Round|Lab Grown|IGI

1.31ct J SI1 Round Lab Grown Diamond

ID • J/SI1 • IGI LG500151220

Shape and cutting style on the report: Round brilliant

Certificate IGI LG500151220

Diamond specifications and retailer prices

From £461 GBP
As of November 5, 2026
Save £1,788 GBP (79%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: £2,250 GBP at MOH London · As of November 5, 2026
View at MOH London

About this 1.31ct lab-grown round diamond

This 1.31ct 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 LG500151220 or 500151220. Listed at 11 retailers as of November 5, 2026, with prices from £461 to £2,250, a £1,788 spread on the same certified stone. MOH London lists it at £2,250. 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

1.31
Carat
J
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle40.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG500151220
Dimensions6.94 × 6.97 × 4.34 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
6.94 mm6.97 mm1.31 ctJ / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG500151220
Side View
Table 56.5%Crown 36°Girdle: MED-STKPavilion 40.3°Culet: NoneDepth 62.4%

Caratlytics Score

How it works →
A
Excellent
Excellent quality and great value
Unlock full score analysis
See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: £2,250 GBP|Low: £443 GBP|High: £2,283 GBP|Avg: £906 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£461 GBP
Retailer 8£517 GBP
Retailer 2£557 GBP
Retailer 6£572 GBP
Retailer 9£572 GBP
Retailer 3£669 GBP
Retailer 7£876 GBP
Retailer 10£903 GBP
Retailer 4£1,421 GBP
MOH London£2,250 GBP

22 data points across 10 retailers

11 retailers£461 GBP to £2,250 GBP

A
Cheapest Retailer
-
£461 GBP
B+
Retailer 2
-
£517 GBP
View
B+
Retailer 3
-
£517 GBP
View
Final sale: no returns
B+
Retailer 4
-
£557 GBP
View
Retailer 5
-
£572 GBP
View
Price last confirmed 21 days ago
B+
Retailer 6
-
£572 GBP
View
B+
Retailer 7
-
£669 GBP
View
B
Retailer 8
-
£876 GBP
View
B
Retailer 9
-
£1,421 GBP
View
B
Retailer 10
-
£1,505 GBP
View
Most Expensive
B
MOH London
LG500151220 · Nov 5
£2,250 GBP
View
10 more retailers have this diamond
Prices start from £461 GBPSave up to £1,788 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
1.31ct Round
£461 GBP