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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 $371 NZD
$209 USD
As of November 1, 2026
Save $1,634 NZD (82%) vs most expensive(unlock to see where)
7 retailers carry this diamond
Most expensive: $2,005 NZD at Brilliant Earth · As of October 31, 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 31, 2026, with prices from $371 to $2,005, a $1,634 spread on the same certified stone. Brilliant Earth lists it at $2,005. 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
Colour
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: Nov 1
Current: $2,005 NZD|Low: $268 NZD|High: $2,342 NZD|Avg: $1,182 NZD|-14.4%
Brilliant Earth
Retailer 2
Retailer 3
Retailer 4
Retailer 5
Retailer 6
Retailer 7
Retailer 8
Retailer 9
Retailer 10
Retailer 11
November 1, 2026
Retailer 8$371 NZD
Retailer 5$688 NZD
Retailer 9$730 NZD
Retailer 4$747 NZD
Retailer 7$850 NZD
Retailer 6$1,022 NZD
Retailer 10$1,159 NZD
Retailer 11$1,391 NZD
Retailer 2$1,816 NZD
Brilliant Earth$2,005 NZD
Retailer 3$2,093 NZD

26 data points across 11 retailers

7 retailers$371 NZD to $2,005 NZD

A
Cheapest Retailer
-
$371 NZD
$209 USD
Final sale: no returns
B+
Retailer 2
-
$688 NZD
$388 USD
View
Retailer 3
-
$747 NZD
€401 EUR
View
Price last confirmed 7 days ago
A
Retailer 4
-
$850 NZD
$479 USD
View
B+
Retailer 5
-
$1,022 NZD
$576 USD
View
B
Retailer 6
-
$1,816 NZD
£806 GBP
View
Most Expensive
B
Brilliant Earth
15325425A · Oct 31
$2,005 NZD
$1,130 USD
View
6 more retailers have this diamond
Prices start from $371 NZDSave up to $1,634 NZD

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
$371 NZD