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Cushion|Lab Grown|IGI

1.51ct D SI1 Cushion Lab Grown Diamond

ID • D/SI1 • IGI LG530292821

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG530292821

Diamond specifications and retailer prices

From $280 USD
As of November 6, 2026
Save $953 USD (77%) vs most expensive(unlock to see where)
15 retailers carry this diamond
Most expensive: $1,233 USD at MOH London · As of November 7, 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 D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG530292821 or 530292821. Listed at 15 retailers as of November 6, 2026, with prices from $280 to $1,233, a $953 spread on the same certified stone. MOH London lists it at $1,233. 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
D
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34.4°
Pavilion angle40.1°
OriginLab Grown
Grading LabIGI
CertificateIGI LG530292821
Dimensions6.78 × 6.55 × 4.36 mm
L/W Ratio1.04
Girdle conditionFaceted
Culet sizePointed
Cert comments
As Grown - No indication of post-growth treatment This Laboratory Grown Diamond was created by High Pressure High Temperature (HPHT) growth process Type II
Top View
6.78 mm6.55 mm1.51 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG530292821
Side View
Table 68.5%Crown 34.4°Girdle: MED-THKPavilion 40.1°Culet: NoneDepth 66.6%

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 6
Current: $1,233 USD|Low: $342 USD|High: $1,280 USD|Avg: $751 USD|-1.5%
MOH London
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
November 7, 2026
Retailer 4$344 USD
Retailer 10$415 USD
Retailer 6$553 USD
Retailer 5$583 USD
Retailer 2$657 USD
Retailer 7$785 USD
Retailer 9$1,030 USD
Retailer 3$1,104 USD
Retailer 8$1,150 USD
MOH London$1,233 USD

39 data points across 10 retailers

15 retailers$280 USD to $1,233 USD

A
Cheapest Retailer
-
$280 USD
Final sale: no returns
A
Retailer 2
-
$309 USD
View
A
Retailer 3
-
$344 USD
View
B+
Retailer 4
-
$415 USD
View
A
Retailer 5
-
$509 USD
View
A
Retailer 6
-
$553 USD
View
A
Retailer 7
-
$559 USD
View
A
Retailer 8
-
$583 USD
View
B+
Retailer 9
-
$657 USD
View
B+
Retailer 10
-
$785 USD
View
Retailer 11
-
$1,030 USD
View
Price last confirmed 17 days ago
B
Retailer 12
-
$1,046 USD
View
B
Retailer 13
-
$1,104 USD
View
B
Retailer 14
-
$1,150 USD
View
Most Expensive
B
MOH London
LG530292821 · Nov 7
$1,233 USD
£971 GBP
View
14 more retailers have this diamond
Prices start from $280 USDSave up to $953 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
$280 USD