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Cushion|Lab Grown|IGI

1.50ct D SI1 Cushion Lab Grown Diamond

ID • D/SI1 • IGI LG678551060

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

Certificate IGI LG678551060

Diamond specifications and retailer prices

From $209 USD
As of October 30, 2026
Save $921 USD (82%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: $1,130 USD at Brilliant Earth · As of October 30, 2026
View at Brilliant Earth

About this 1.5ct lab-grown cushion diamond

This 1.5ct 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 LG678551060 or 678551060. Listed at 7 retailers as of October 30, 2026, with prices from $209 to $1,130, a $921 spread on the same certified stone. Brilliant Earth lists it at $1,130. 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

1.50
Carat
D
Color
SI1
Clarity
Ideal
Cut

Specifications

CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
Crown angle34°
Pavilion angle36.9°
OriginLab Grown
Grading LabIGI
CertificateIGI LG678551060
Dimensions6.66 × 6.55 × 4.12 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
6.66 mm6.55 mm1.50 ctD / SI1
OriginLab Grown
CutIdeal
PolishExcellent
SymmetryExcellent
FluorescenceNone
CertificateIGI LG678551060
Side View
Table 61.0%Crown 34°Girdle: STK-VTKPavilion 36.9°Culet: NoneDepth 62.9%

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: Oct 30
Current: $1,130 USD|Low: $151 USD|High: $1,320 USD|Avg: $667 USD|-14.4%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
October 30, 2026
Retailer 8$209 USD
Retailer 5$388 USD
Retailer 9$411 USD
Retailer 2$421 USD
Retailer 7$479 USD
Retailer 6$576 USD
Retailer 10$653 USD
Retailer 11$784 USD
Retailer 4$1,030 USD
Brilliant Earth$1,130 USD
Retailer 3$1,180 USD

25 data points across 11 retailers

7 retailers$209 USD to $1,130 USD

A
Cheapest Retailer
-
$209 USD
Final sale: no returns
B+
Retailer 2
-
$388 USD
View
A
Retailer 3
-
$421 USD
€401 EUR
View
A
Retailer 4
-
$479 USD
View
B+
Retailer 5
-
$576 USD
View
B
Retailer 6
-
$1,030 USD
£811 GBP
View
Most Expensive
B
Brilliant Earth
15325425A · Oct 30
$1,130 USD
View
6 more retailers have this diamond
Prices start from $209 USDSave up to $921 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
1.50ct Cushion
$209 USD