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Cushion|Lab Grown|IGI

1.51ct E SI1 Cushion Lab Grown Diamond

ID • E/SI1 • IGI LG529246828

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG529246828

Diamond specifications and retailer prices

From $253 USD
As of November 6, 2026
Save $1,025 USD (80%) vs most expensive(unlock to see where)
12 retailers carry this diamond
Most expensive: $1,278 USD at Reve Diamonds · As of November 6, 2026
View at Reve Diamonds

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 E colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG529246828 or 529246828. Listed at 12 retailers as of November 6, 2026, with prices from $253 to $1,278, a $1,025 spread on the same certified stone. Reve Diamonds lists it at $1,278. 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
E
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle36.6°
Pavilion angle35.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG529246828
Dimensions6.73 × 6.47 × 4.22 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
6.73 mm6.47 mm1.51 ctE / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG529246828
Side View
Table 56.5%Crown 36.6°Girdle: MED-THKPavilion 35.8°Culet: NoneDepth 65.2%

Caratlytics Score

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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: $449 USD|Low: $253 USD|High: $1,278 USD|Avg: $645 USD|+10.3%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
Reve Diamonds
November 6, 2026
Retailer 2$253 USD
Retailer 3$281 USD
Retailer 4$357 USD
Retailer 9$378 USD
Retailer 1$449 USD
Retailer 11$463 USD
Retailer 5$518 USD
Retailer 8$533 USD
Retailer 10$954 USD
Retailer 7$960 USD
Retailer 6$1,121 USD
Reve Diamonds$1,278 USD

40 data points across 12 retailers

12 retailers$253 USD to $1,278 USD

A
Cheapest Retailer
-
$253 USD
Final sale: no returns
Retailer 2
-
$281 USD
View
Price last confirmed 12 days ago
A
Retailer 3
-
$357 USD
View
B+
Retailer 4
-
$378 USD
View
A
Retailer 5
-
$449 USD
View
A
Retailer 6
-
$463 USD
View
B+
Retailer 7
-
$518 USD
View
B+
Retailer 8
-
$533 USD
View
B
Retailer 9
-
$954 USD
View
B+
Retailer 10
-
$960 USD
View
B
Retailer 11
-
$1,121 USD
View
Most Expensive
B
Reve Diamonds
DC166055E · Nov 6
$1,278 USD
View
11 more retailers have this diamond
Prices start from $253 USDSave up to $1,025 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
$253 USD