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Cushion|Lab Grown|IGI

1.51ct D SI1 Cushion Lab Grown Diamond

ID • D/SI1 • IGI LG510184945

Shape and cutting style on the report: Square cushion brilliant

Certificate IGI LG510184945

Diamond specifications and retailer prices

From $238 USD
As of November 6, 2026
Save $996 USD (81%) vs most expensive(unlock to see where)
10 retailers carry this diamond
Most expensive: $1,234 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 D colour (colourless) and SI1 clarity (slightly-included), with a top-tier cut grade and certified by IGI LG510184945 or 510184945. Listed at 10 retailers as of November 6, 2026, with prices from $238 to $1,234, a $996 spread on the same certified stone. Reve Diamonds lists it at $1,234. 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 angle36.9°
Pavilion angle40.8°
OriginLab Grown
Grading LabIGI
CertificateIGI LG510184945
Dimensions6.56 × 6.51 × 4.58 mm
L/W Ratio1.01
Girdle conditionFaceted
Culet sizeNone
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
6.56 mm6.51 mm1.51 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG510184945
Side View
Table 62.5%Crown 36.9°Girdle: MED-THKPavilion 40.8°Culet: NoneDepth 70.4%

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: $291 USD|Low: $238 USD|High: $1,234 USD|Avg: $600 USD|-2.0%
Retailer 1
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Reve Diamonds
November 6, 2026
Retailer 9$238 USD
Retailer 4$264 USD
Retailer 1$291 USD
Retailer 5$453 USD
Retailer 2$483 USD
Retailer 7$496 USD
Retailer 6$518 USD
Retailer 8$900 USD
Retailer 3$1,062 USD
Reve Diamonds$1,234 USD

24 data points across 10 retailers

10 retailers$238 USD to $1,234 USD

A
Cheapest Retailer
-
$238 USD
Final sale: no returns
Retailer 2
-
$264 USD
View
Price last confirmed 22 days ago
A
Retailer 3
-
$291 USD
View
A
Retailer 4
-
$453 USD
View
A
Retailer 5
-
$483 USD
View
A
Retailer 6
-
$496 USD
View
Retailer 7
-
$518 USD
View
Price last confirmed 9 days ago
B+
Retailer 8
-
$900 USD
View
Retailer 9
-
$1,062 USD
View
Price last confirmed 19 days ago
Most Expensive
B
Reve Diamonds
3619ABFDA · Nov 6
$1,234 USD
View
9 more retailers have this diamond
Prices start from $238 USDSave up to $996 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
$238 USD