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Cushion|Lab Grown|IGI

1.51ct I SI1 Cushion Lab Grown Diamond

ID • I/SI1 • IGI LG436046931

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG436046931

Diamond specifications and retailer prices

From $840 USD
As of November 6, 2026
Save $4,022 USD (83%) vs most expensive(unlock to see where)
6 retailers carry this diamond
Most expensive: $4,862 USD at MOH London · As of November 1, 2026
View at MOH London

About this 1.51ct lab-grown cushion diamond

This 1.51ct lab-grown cushion sits in the one-and-a-half to two carat band, graded I colour (near-colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG436046931 or 436046931. Listed at 6 retailers as of November 1, 2026, with prices from $840 to $4,862, a $4,022 spread on the same certified stone. MOH London lists it at $4,862. 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

1.51
Carat
I
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle35.6°
Pavilion angle39.5°
OriginLab Grown
Grading LabIGI
CertificateIGI LG436046931
Dimensions7.26 × 6.91 × 4.30 mm
L/W Ratio1.05
Girdle conditionFaceted
Culet sizePointed
Cert comments
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Top View
7.26 mm6.91 mm1.51 ctI / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG436046931
Side View
Table 56.0%Crown 35.6°Girdle: MED-STKPavilion 39.5°Culet: NoneDepth 62.2%

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: Nov 6
Current: $4,862 USD|Low: $840 USD|High: $4,920 USD|Avg: $2,333 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 2$840 USD
Retailer 5$1,461 USD
Retailer 4$1,513 USD
Retailer 6$1,685 USD
Retailer 10$1,747 USD
Retailer 9$1,866 USD
Retailer 7$2,084 USD
Retailer 3$2,393 USD
Retailer 8$4,331 USD
MOH London$4,862 USD

10 data points across 10 retailers

6 retailers$840 USD to $4,862 USD

A
Cheapest Retailer
-
$840 USD
B
Retailer 2
-
$1,461 USD
View
Final sale: no returns
Retailer 3
-
$1,513 USD
View
Price last confirmed 25 days ago
B
Retailer 4
-
$1,685 USD
View
B
Retailer 5
-
$2,393 USD
View
Most Expensive
B
MOH London
LG436046931 · Nov 1
$4,862 USD
£3,828 GBP
View
5 more retailers have this diamond
Prices start from $840 USDSave up to $4,022 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
1.51ct Cushion
$840 USD