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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 $887 AUD
As of November 5, 2026
Save $3,438 AUD (79%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $4,325 AUD 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 $887 to $4,325, a $3,438 spread on the same certified stone. MOH London lists it at $4,325. 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
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See the detailed 0 to 100 score with Quality, Value, Certification & Market breakdown

Price History

Last verified: Nov 5
Current: $4,325 AUD|Low: $851 AUD|High: $4,389 AUD|Avg: $1,741 AUD|-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$887 AUD
Retailer 8$994 AUD
Retailer 2$1,071 AUD
Retailer 6$1,100 AUD
Retailer 9$1,100 AUD
Retailer 3$1,286 AUD
Retailer 7$1,684 AUD
Retailer 10$1,736 AUD
Retailer 4$2,731 AUD
MOH London$4,325 AUD

22 data points across 10 retailers

11 retailers$887 AUD to $4,325 AUD

A
Cheapest Retailer
-
$887 AUD
B+
Retailer 2
-
$994 AUD
View
B+
Retailer 3
-
$994 AUD
View
Final sale: no returns
B+
Retailer 4
-
$1,071 AUD
View
Retailer 5
-
$1,100 AUD
View
Price last confirmed 21 days ago
B+
Retailer 6
-
$1,100 AUD
View
B+
Retailer 7
-
$1,286 AUD
View
B
Retailer 8
-
$1,684 AUD
View
B
Retailer 9
-
$2,731 AUD
View
B
Retailer 10
-
$2,894 AUD
View
Most Expensive
B
MOH London
LG500151220 · Nov 5
$4,325 AUD
£2,384 GBP
View
10 more retailers have this diamond
Prices start from $887 AUDSave up to $3,438 AUD

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
$887 AUD