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Cushion|Lab Grown|IGI

1.51ct D IF Cushion Lab Grown Diamond

EX • D/IF • IGI LG728533556

Shape and cutting style on the report: Square cushion modified brilliant

Certificate IGI LG728533556

Diamond specifications and retailer prices

From $517 USD
As of November 3, 2026
Save $2,473 USD (83%) vs most expensive(unlock to see where)
19 retailers carry this diamond
Most expensive: $2,990 USD at Brilliant Earth · As of November 3, 2026
View at Brilliant Earth

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 IF clarity (flawless or internally-flawless), with a top-tier cut grade and certified by IGI LG728533556 or 728533556. Listed at 19 retailers as of November 3, 2026, with prices from $517 to $2,990, a $2,473 spread on the same certified stone. Brilliant Earth lists it at $2,990. Compare the cross-retailer prices above before buying. The same certified stone often varies 15 to 40% across stores.

The 4Cs

1.51
Carat
D
Color
IF
Clarity
Excellent
Cut

Specifications

CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34°
Pavilion angle33.6°
OriginLab Grown
Grading LabIGI
CertificateIGI LG728533556
Dimensions6.54 × 6.41 × 4.14 mm
L/W Ratio1.02
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
6.54 mm6.41 mm1.51 ctD / IF
OriginLab Grown
CutExcellent
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG728533556
Side View
Table 59.0%Crown 34°Girdle: MED-THKPavilion 33.6°Culet: NoneDepth 64.6%

Caratlytics Score

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A
Excellent
Excellent quality and great value
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Price History

Last verified: Nov 3
Current: $2,990 USD|Low: $517 USD|High: $4,390 USD|Avg: $1,584 USD|-31.9%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Retailer 12
Retailer 13
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Retailer 18
November 3, 2026
Retailer 14$517 USD
Retailer 8$628 USD
Retailer 7$725 USD
Retailer 17$768 USD
Retailer 3$869 USD
Retailer 9$925 USD
Retailer 2$949 USD
Retailer 12$988 USD
Retailer 13$1,066 USD
Retailer 11$1,339 USD
Retailer 6$1,464 USD
Retailer 4$1,770 USD
Retailer 15$1,872 USD
Retailer 18$2,029 USD
Retailer 10$2,073 USD
Retailer 16$2,104 USD
Retailer 5$2,424 USD
Brilliant Earth$2,990 USD

38 data points across 18 retailers

19 retailers$517 USD to $2,990 USD

A
Cheapest Retailer
-
$517 USD
Final sale: no returns
Retailer 2
-
$628 USD
View
Price last confirmed 18 days ago
A
Retailer 3
-
$725 USD
View
A
Retailer 4
-
$768 USD
View
A
Retailer 5
-
$869 USD
€828 EUR
View
A
Retailer 6
-
$925 USD
View
A
Retailer 7
-
$949 USD
£747 GBP
View
A
Retailer 8
-
$988 USD
ZAR 15,957 ZAR
View
A
Retailer 9
-
$1,066 USD
View
A
Retailer 10
-
$1,339 USD
View
B+
Retailer 11
-
$1,464 USD
A$2,252 AUD
View
B+
Retailer 12
-
$1,770 USD
View
B+
Retailer 13
-
$1,872 USD
View
B+
Retailer 14
-
$2,029 USD
View
Retailer 15
-
$2,073 USD
£1,632 GBP
View
Price last confirmed 23 days ago
B+
Retailer 16
-
$2,104 USD
£1,657 GBP
View
B+
Retailer 17
-
$2,424 USD
A$3,729 AUD
View
B
Retailer 18
-
$2,845 USD
£2,240 GBP
View
Price last confirmed 7 days ago
Most Expensive
B
Brilliant Earth
15509665A · Nov 3
$2,990 USD
View
18 more retailers have this diamond
Prices start from $517 USDSave up to $2,473 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
$517 USD