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Round|Lab Grown|IGI

1.31ct J SI1 Round Lab Grown Diamond

ID • J/SI1 • IGI LG500151220

Shape and cutting style on the report: Round brilliant

Certificate IGI LG500151220

Diamond specifications and retailer prices

From $621 USD
As of November 1, 2026
Save $2,414 USD (80%) vs most expensive(unlock to see where)
11 retailers carry this diamond
Most expensive: $3,035 USD 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 J colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG500151220 or 500151220. Listed at 11 retailers as of November 1, 2026, with prices from $621 to $3,035, a $2,414 spread on the same certified stone. MOH London lists it at $3,035. 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
J
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36°
Pavilion angle40.3°
OriginLab Grown
Grading LabIGI
CertificateIGI LG500151220
Dimensions6.94 × 6.97 × 4.34 mm
L/W Ratio1.00
Girdle conditionFaceted
Culet sizePointed
Cert comments
This Laboratory Grown Diamond was created by Chemical Vapor Deposition (CVD) growth process and may include post-growth treatment Type IIa
Top View
6.94 mm6.97 mm1.31 ctJ / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG500151220
Side View
Table 56.5%Crown 36°Girdle: MED-STKPavilion 40.3°Culet: NoneDepth 62.4%

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 1
Current: $3,035 USD|Low: $596 USD|High: $3,072 USD|Avg: $1,212 USD
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 1, 2026
Retailer 5$621 USD
Retailer 8$696 USD
Retailer 2$750 USD
Retailer 6$770 USD
Retailer 9$770 USD
Retailer 3$900 USD
Retailer 7$1,179 USD
Retailer 10$1,215 USD
Retailer 4$1,912 USD
MOH London$3,035 USD

23 data points across 10 retailers

11 retailers$621 USD to $3,035 USD

A
Cheapest Retailer
-
$621 USD
B+
Retailer 2
-
$696 USD
View
B+
Retailer 3
-
$696 USD
View
Final sale: no returns
B+
Retailer 4
-
$750 USD
View
Retailer 5
-
$770 USD
View
Price last confirmed 15 days ago
B+
Retailer 6
-
$770 USD
View
B+
Retailer 7
-
$900 USD
View
B
Retailer 8
-
$1,179 USD
View
B
Retailer 9
-
$1,912 USD
View
B
Retailer 10
-
$2,026 USD
View
Most Expensive
B
MOH London
LG500151220 · Nov 1
$3,035 USD
£2,390 GBP
View
10 more retailers have this diamond
Prices start from $621 USDSave up to $2,414 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
$621 USD