CaratHunter
Plans
Round|Lab Grown|IGI

1.31ct I SI1 Round Lab Grown Diamond

ID • I/SI1 • IGI LG459130921

Shape and cutting style on the report: Round brilliant

Certificate IGI LG459130921

Diamond specifications and retailer prices

From $1,053 AUD
$740 USD
As of October 31, 2026
Save $3,656 AUD (78%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $4,710 AUD at MOH London · As of October 26, 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 I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG459130921 or 459130921. Listed at 11 retailers as of October 26, 2026, with prices from $1,053 to $4,710, a $3,656 spread on the same certified stone. MOH London lists it at $4,710. 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
I
Colour
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.5°
Pavilion angle40.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG459130921
Dimensions7.07 × 7.10 × 4.25 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
7.07 mm7.10 mm1.31 ctI / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG459130921
Side View
Table 59.5%Crown 33.5°GirdlePavilion 40.5°Culet: NoneDepth 59.9%

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: Oct 31
Current: $4,710 AUD|Low: $1,038 AUD|High: $4,766 AUD|Avg: $1,916 AUD|+0.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
October 30, 2026
Retailer 2$1,053 AUD
Retailer 4$1,082 AUD
Retailer 8$1,210 AUD
Retailer 6$1,254 AUD
Retailer 9$1,254 AUD
Retailer 5$1,509 AUD
Retailer 10$1,969 AUD
Retailer 7$2,030 AUD
Retailer 3$2,984 AUD
MOH London$4,710 AUD

16 data points across 10 retailers

11 retailers$1,053 AUD to $4,710 AUD

A
Cheapest Retailer
-
$1,053 AUD
$740 USD
A
Retailer 2
-
$1,082 AUD
$760 USD
View
B+
Retailer 3
-
$1,177 AUD
$827 USD
View
B+
Retailer 4
-
$1,210 AUD
$850 USD
View
Final sale: no returns
B+
Retailer 5
-
$1,254 AUD
$881 USD
View
Retailer 6
-
$1,254 AUD
$881 USD
View
Price last confirmed 20 days ago
B+
Retailer 7
-
$1,509 AUD
$1,060 USD
View
B
Retailer 8
-
$2,030 AUD
$1,426 USD
View
B
Retailer 9
-
$2,984 AUD
$2,096 USD
View
B
Retailer 10
-
$3,528 AUD
$2,478 USD
View
Most Expensive
B
MOH London
LG459130921 · Oct 26
$4,710 AUD
£2,605 GBP
View
10 more retailers have this diamond
Prices start from $1,053 AUDSave up to $3,656 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
$1,053 AUD