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Round|Lab Grown|IGI

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 $750 USD
As of October 30, 2026
Save $2,558 USD (77%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $3,308 USD 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 LG451055654 or 451055654. Listed at 11 retailers as of October 26, 2026, with prices from $750 to $3,308, a $2,558 spread on the same certified stone. MOH London lists it at $3,308. 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
Color
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 30
Current: $3,308 USD|Low: $729 USD|High: $3,344 USD|Avg: $1,463 USD|-0.9%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
October 30, 2026
Retailer 2$750 USD
Retailer 5$760 USD
Retailer 9$850 USD
Retailer 6$881 USD
Retailer 10$881 USD
Retailer 8$1,060 USD
Retailer 11$1,383 USD
Retailer 7$1,426 USD
Retailer 4$2,096 USD
Retailer 3$2,522 USD
MOH London$3,308 USD

15 data points across 11 retailers

11 retailers$750 USD to $3,308 USD

A
Cheapest Retailer
-
$750 USD
A
Retailer 2
-
$760 USD
View
A
Retailer 3
-
$827 USD
View
B+
Retailer 4
-
$850 USD
View
Final sale: no returns
B+
Retailer 5
-
$881 USD
View
Retailer 6
-
$881 USD
View
Price last confirmed 18 days ago
B+
Retailer 7
-
$1,060 USD
View
B
Retailer 8
-
$1,426 USD
View
B
Retailer 9
-
$2,096 USD
View
B
Retailer 10
-
$2,478 USD
View
Most Expensive
B
MOH London
LG451055654 · Oct 26
$3,308 USD
£2,605 GBP
View
10 more retailers have this diamond
Prices start from $750 USDSave up to $2,558 USD

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
$750 USD