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Round|Lab Grown|IGI

1.31ct E SI2 Round Lab Grown Diamond

ID • E/SI2 • IGI LG436056961

Shape and cutting style on the report: Round brilliant

Certificate IGI LG436056961

Diamond specifications and retailer prices

From $366 USD
£288 GBP
As of October 30, 2026
Save $158 USD (30%) vs most expensive(unlock to see where)
4 retailers carry this diamond
Most expensive: $975 USD at MOH London · As of October 15, 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 E colour (colourless) and SI2 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG436056961 or 436056961. Listed at 4 retailers as of October 29, 2026, with a 43% spread between the cheapest and most expensive listing. That is exactly the kind of price-discovery gap Carat Hunter was built to surface. 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
E
Color
SI2
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle33.6°
Pavilion angle40.7°
OriginLab Grown
Grading LabIGI
CertificateIGI LG436056961
Dimensions7.05 × 7.09 × 4.28 mm
L/W Ratio1.01
Girdle conditionFaceted
Cert comments
As Grown - No indication of post growth treatment. This Laboratory Grown Diamond was created by high pressure high temperature process (HPHT).
Top View
7.05 mm7.09 mm1.31 ctE / SI2
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG436056961
Side View
Table 57.5%Crown 33.6°Girdle: MediumPavilion 40.7°Culet: NoneDepth 60.5%

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: Oct 30
Current: $975 USD|Low: $280 USD|High: $977 USD|Avg: $540 USD|-0.1%
MOH London
Retailer 2
Retailer 3
Retailer 4
October 30, 2026
Retailer 2$366 USD
Retailer 3$371 USD
Retailer 4$524 USD
MOH London$975 USD

33 data points across 4 retailers

4 retailers$366 USD to $524 USD

A
Cheapest Retailer
-
$366 USD
£288 GBP
B+
Retailer 2
-
$371 USD
View
B+
Retailer 3
-
$524 USD
View
Most Expensive
MOH London
LG436056961 · Oct 15
$975 USD
£768 GBP
View
Price last confirmed 15 days ago
3 more retailers have this diamond
Prices start from $366 USDSave up to $158 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
$366 USD