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1.31ct I SI1 Round Lab Grown Diamond

EX • I/SI1 • IGI LG451055654

Shape and cutting style on the report: Round brilliant

Certificate IGI LG451055654

Diamond specifications and retailer prices

From $1,331 NZD
$750 USD
As of October 31, 2026
Save $4,533 NZD (77%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $5,863 NZD at MOH London · As of November 1, 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 LG451055654 or 451055654. Listed at 11 retailers as of October 31, 2026, with prices from $1,331 to $5,863, a $4,533 spread on the same certified stone. MOH London lists it at $5,863. 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
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle32.2°
Pavilion angle41.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG451055654
Dimensions7.11 × 7.14 × 4.32 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
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Top View
7.11 mm7.14 mm1.31 ctI / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG451055654
Side View
Table 56.0%Crown 32.2°Girdle: THN-MEDPavilion 41.1°Culet: NoneDepth 60.8%

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: $5,863 NZD|Low: $1,293 NZD|High: $5,933 NZD|Avg: $2,594 NZD|-1.0%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 1, 2026
Retailer 2$1,331 NZD
Retailer 5$1,348 NZD
Retailer 9$1,508 NZD
Retailer 6$1,563 NZD
Retailer 10$1,563 NZD
Retailer 8$1,881 NZD
Retailer 11$2,454 NZD
Retailer 7$2,530 NZD
Retailer 4$3,719 NZD
Retailer 3$4,475 NZD
MOH London$5,863 NZD

16 data points across 11 retailers

11 retailers$1,331 NZD to $5,863 NZD

A
Cheapest Retailer
-
$1,331 NZD
$750 USD
A
Retailer 2
-
$1,348 NZD
$760 USD
View
A
Retailer 3
-
$1,467 NZD
$827 USD
View
B+
Retailer 4
-
$1,508 NZD
$850 USD
View
Final sale: no returns
B+
Retailer 5
-
$1,563 NZD
$881 USD
View
Retailer 6
-
$1,563 NZD
$881 USD
View
Price last confirmed 20 days ago
B+
Retailer 7
-
$1,881 NZD
$1,060 USD
View
B
Retailer 8
-
$2,530 NZD
$1,426 USD
View
B
Retailer 9
-
$3,719 NZD
$2,096 USD
View
B
Retailer 10
-
$4,397 NZD
$2,478 USD
View
Most Expensive
B
MOH London
LG451055654 · Nov 1
$5,863 NZD
£2,602 GBP
View
10 more retailers have this diamond
Prices start from $1,331 NZDSave up to $4,533 NZD

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
$1,331 NZD