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Round|Lab Grown|IGI

1.26ct J SI1 Round Lab Grown Diamond

EX • J/SI1 • IGI LG451057956

Shape and cutting style on the report: Round brilliant

Certificate IGI LG451057956

Diamond specifications and retailer prices

From $599 USD
As of November 5, 2026
Save $2,624 USD (81%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $3,223 USD at MOH London · As of November 1, 2026
View at MOH London

About this 1.26ct lab-grown round diamond

This 1.26ct lab-grown round sits in the one-and-a-quarter to one-and-a-half carat band, graded J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG451057956 or 451057956. Listed at 11 retailers as of November 1, 2026, with prices from $599 to $3,223, a $2,624 spread on the same certified stone. MOH London lists it at $3,223. 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

1.26
Carat
J
Color
SI1
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle31.5°
Pavilion angle40.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG451057956
Dimensions7.16 × 7.05 × 4.17 mm
L/W Ratio1.02
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) process Type IIa
Top View
7.16 mm7.05 mm1.26 ctJ / SI1
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG451057956
Side View
Table 57.0%Crown 31.5°Girdle: MediumPavilion 40.3°Culet: NoneDepth 59.1%

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: Nov 5
Current: $3,223 USD|Low: $575 USD|High: $3,261 USD|Avg: $1,272 USD
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 6$599 USD
Retailer 9$669 USD
Retailer 2$720 USD
Retailer 7$742 USD
Retailer 10$742 USD
Retailer 4$870 USD
Retailer 8$1,139 USD
Retailer 11$1,179 USD
Retailer 5$1,842 USD
Retailer 3$1,987 USD
MOH London$3,223 USD

19 data points across 11 retailers

11 retailers$599 USD to $3,223 USD

A
Cheapest Retailer
-
$599 USD
B+
Retailer 2
-
$669 USD
View
Final sale: no returns
B+
Retailer 3
-
$670 USD
View
B+
Retailer 4
-
$720 USD
View
Retailer 5
-
$742 USD
View
Price last confirmed 21 days ago
B+
Retailer 6
-
$742 USD
View
B+
Retailer 7
-
$870 USD
View
B
Retailer 8
-
$1,139 USD
View
B
Retailer 9
-
$1,842 USD
View
B
Retailer 10
-
$1,952 USD
View
Most Expensive
B
MOH London
LG451057956 · Nov 1
$3,223 USD
£2,538 GBP
View
10 more retailers have this diamond
Prices start from $599 USDSave up to $2,624 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
1.26ct Round
$599 USD