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Round|Lab Grown|IGI

1.31ct I SI1 Round Lab Grown Diamond

ID • I/SI1 • IGI LG451055666

Shape and cutting style on the report: Round brilliant

Certificate IGI LG451055666

Diamond specifications and retailer prices

From $740 USD
As of October 30, 2026
Save $2,582 USD (78%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $3,322 USD at MOH London · As of October 29, 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 LG451055666 or 451055666. Listed at 11 retailers as of October 29, 2026, with prices from $740 to $3,322, a $2,582 spread on the same certified stone. MOH London lists it at $3,322. 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
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.9°
Pavilion angle40.2°
OriginLab Grown
Grading LabIGI
CertificateIGI LG451055666
Dimensions6.96 × 6.97 × 4.35 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
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Top View
6.96 mm6.97 mm1.31 ctI / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG451055666
Side View
Table 55.0%Crown 35.9°Girdle: MED-STKPavilion 40.2°Culet: NoneDepth 62.5%

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: $3,322 USD|Low: $729 USD|High: $3,348 USD|Avg: $1,401 USD|+0.5%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
October 30, 2026
Retailer 2$740 USD
Retailer 4$760 USD
Retailer 8$850 USD
Retailer 6$881 USD
Retailer 5$1,060 USD
Retailer 9$1,383 USD
Retailer 7$1,426 USD
Retailer 3$2,096 USD
MOH London$3,322 USD

15 data points across 9 retailers

11 retailers$740 USD to $3,322 USD

A
Cheapest Retailer
-
$740 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 19 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
LG451055666 · Oct 29
$3,322 USD
£2,616 GBP
View
10 more retailers have this diamond
Prices start from $740 USDSave up to $2,582 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
$740 USD